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CHEMISTRY (597 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 7)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Full-text available via subscription   (Followers: 31)
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Acta Chemica Iasi     Open Access   (Followers: 2)
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Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
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adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
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Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
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African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 2)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
AMB Express     Open Access   (Followers: 1)
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American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 65)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 14)
American Journal of Chemistry     Open Access   (Followers: 25)
American Journal of Plant Physiology     Open Access   (Followers: 13)
American Mineralogist     Full-text available via subscription   (Followers: 12)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 153)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 203)
Annales UMCS, Chemia     Open Access   (Followers: 1)
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Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 14)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
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Applied Organometallic Chemistry     Hybrid Journal   (Followers: 6)
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Applied Surface Science     Hybrid Journal   (Followers: 26)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Atomization and Sprays     Full-text available via subscription   (Followers: 3)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
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Bioinspired Materials     Open Access   (Followers: 3)
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Biointerphases     Open Access   (Followers: 1)
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Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 99)
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Biosensors     Open Access   (Followers: 2)
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Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 2)
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Full-text available via subscription   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 3)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 67)
Catalysis for Sustainable Energy     Open Access   (Followers: 6)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 7)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 12)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 69)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 23)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 19)
Chemical Reviews     Full-text available via subscription   (Followers: 165)
Chemical Science     Open Access   (Followers: 21)
Chemical Technology     Open Access   (Followers: 15)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 4)
Chemical Week     Full-text available via subscription   (Followers: 7)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 55)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 25)
ChemInform     Hybrid Journal   (Followers: 7)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 6)
Chemistry & Biology     Full-text available via subscription   (Followers: 30)
Chemistry & Industry     Hybrid Journal   (Followers: 5)
Chemistry - A European Journal     Hybrid Journal   (Followers: 136)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 17)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 43)
Chemistry of Materials     Full-text available via subscription   (Followers: 189)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 2)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 8)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 10)
Chromatographia     Hybrid Journal   (Followers: 23)
Chromatography Research International     Open Access   (Followers: 7)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 10)
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 3)
Combustion Science and Technology     Hybrid Journal   (Followers: 18)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 2)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 9)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 2)
Copernican Letters     Open Access  
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 3)
CrystEngComm     Full-text available via subscription   (Followers: 10)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 4)
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
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Current Science     Open Access   (Followers: 48)
Dalton Transactions     Full-text available via subscription   (Followers: 18)
Detection     Open Access   (Followers: 2)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 11)
Dislocations in Solids     Full-text available via subscription  
Doklady Chemistry     Hybrid Journal  
Drying Technology: An International Journal     Hybrid Journal   (Followers: 3)
Eclética Química     Open Access   (Followers: 1)
Ecological Chemistry and Engineering S     Open Access   (Followers: 4)
Ecotoxicology and Environmental Contamination     Open Access  
Educación Química     Open Access   (Followers: 1)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
EJNMMI Radiopharmacy and Chemistry     Open Access  
Elements     Full-text available via subscription   (Followers: 2)
Environmental Chemistry     Hybrid Journal   (Followers: 8)
Environmental Chemistry Letters     Hybrid Journal   (Followers: 4)
Environmental Science & Technology Letters     Full-text available via subscription   (Followers: 5)
Environmental Science : Nano     Partially Free   (Followers: 1)
Environmental Toxicology & Chemistry     Hybrid Journal   (Followers: 19)

        1 2 3 | Last

Journal Cover Canadian Mineralogist
  [SJR: 0.591]   [H-I: 54]   [3 followers]  Follow
   Full-text available via subscription Subscription journal
   ISSN (Print) 0008-4476 - ISSN (Online) 1499-1276
   Published by GeoScienceWorld Homepage  [16 journals]
  • Mineralogy and Origin of Exsolution In Ti-Rich Magnetite From Different
           Magmatic Fe-Ti Oxide-Bearing Intrusions
    • Authors: Tan, W; Liu, P, He, H, Wang, C. Y, Liang, X.
      Pages: 539 - 553
      Abstract: Titanium-rich magnetite from different magmatic Fe-Ti oxide-bearing intrusions consists of host magnetite (nearly pure Fe3O4) and different types of exsolution. The exsolution of Ti-rich magnetite is indicative of the physical and chemical conditions at which the host intrusions formed. However, the mechanisms to form these types of exsolution have been debated. To examine the formation mechanisms of the different types of exsolution, multiple microanalytical techniques, such as electron microprobe analysis, micro Raman spectroscopy, and micro X-ray diffraction, were used to examine the chemical composition, morphology, and crystalline structure of exsolved minerals in Ti-rich magnetite from different Fe-Ti oxide-bearing intrusions in China. The characterization results indicate that pleonaste and ilmenite are the two dominant exsolution phases in the Ti-rich magnetite, whereas the ulvöspinel phase is barely found. The ilmenite exsolution may have different origins: (1) the cloth-texture lamellae primarily exsolved as ulvöspinel, which was oxidized to ilmenite later at 600 °C; (3) some ilmenite lamellae exsolved directly from cation-deficient solid solution due to the substitution of Ti4+ + -> 2Fe2+; (4) sub-solidus re-equilibration of coexisting Fe-Ti oxides can also lead to ilmenite exsolution in Ti-rich magnetite and magnetite exsolution in ilmenite.
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.1400069
      Issue No: Vol. 54, No. 3 (2017)
  • Revision of the Formulae of Wernerbaurite and Schindlerite: Ammonium-
           Rather Than Hydronium-Bearing Decavanadate Minerals
    • Authors: Kampf, A. R; Hughes, J. M, Nash, B. P, Marty, J, Cooper, M. A, Hawthorne, F. C, Karpenko, V. Y, Pautov, L. A, Agakhanov, A. A.
      Pages: 555 - 558
      Abstract: Wernerbaurite (IMA 2012–064) and schindlerite (IMA 2012–063) from the St. Jude mine, Slick Rock district, San Miguel County, Colorado, USA, were described as hydronium-bearing decavanadate minerals with the formulae {[Ca(H2O)7]2(H2O)2(H3O)2}{V10O28} and {[Na2(H2O)10](H3O)4}{V10O28}, respectively. Because these phases correspond to known synthetic phases with these formulae, the presence of NH4 in these minerals was not considered. Recent investigations of a similar phase discovered at a vanadium locality in the Fergana Valley of Kyrgyzstan showed it to contain NH4, leading us to reanalyze the original electron-microprobe mounts of wernerbaurite and schindlerite, specifically seeking N; those analyses confirmed the presence of sufficient NH4 to replace the originally assigned H3O. With the additional H sites included and O replaced by N at the NH4 sites, the structure refinement residual improved for wernerbaurite from R1 = 3.41% to R1 = 3.26% and for schindlerite from R1 = 3.99% to R1 = 3.70%. The newly assigned NH4 sites exhibited normal NH4–O bond distances and coordination and reasonable bond-valence sums. The H3O synthetic equivalents of both phases had been reported, as well as the NH4 synthetic equivalent of schindlerite. Subsequent to the publication of the original description of the minerals, the NH4 equivalent of wernerbaurite has also been reported.
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.1500081
      Issue No: Vol. 54, No. 3 (2017)
  • The Influence of Redox State On Mica Crystallization In Leucogranitic and
           Pegmatitic Liquids
    • Authors: Pichavant, M; Villaros, A, Deveaud, S, Scaillet, B, Lahlafi, M.
      Pages: 559 - 581
      Abstract: Experiments have been performed both on a peraluminous leucogranitic (DK89) and a F-, Li-, P-rich pegmatitic (B2) melt to constrain the stability of micas in evolved crustal silicic magmas and refine mica-melt partition coefficients for F, Li, and Be. The experiments were conducted in parallel in two fO2 ranges, "oxidizing" (NNO +1 to +3) and "reducing" (NNO –1.6 to –1.4). One two-stage reducing-oxidizing experiment was conducted in a vessel fitted with a H2-permeable Shaw-type membrane. The approach toward equilibrium was tested by imposing long experimental durations and combining mica crystallization experiments with mica dissolution experiments using mica seeds. Experimental micas and melts were analyzed for major elements by electron microprobe and for light elements by nuclear microprobe. At 3 kbar, 620 °C, and under oxidizing conditions, B2 crystallized only muscovite, the biotite seeds reacting to form a new mica intermediate between phengite and Li-rich phengite. Under reducing conditions, biotite (siderophyllite composition) appeared as the stable mica. The two-stage experiment yielded a composite mica assemblage with siderophyllite cores mantled by muscovite rims. At 3.5–3.8 kbar, 720 °C, and under oxidizing conditions, DK89 crystallized only aluminous biotite and muscovite seeds reacted to form biotite-bearing assemblages; muscovite appeared together with biotite at 700 °C. Under reducing conditions, Al-rich biotite is also the stable mica at 720 °C. Partition coefficients show that F and Li are preferentially incorporated in biotite rather than in muscovite, the opposite as for Be. Biotite fractionation buffers the F and increases the Li and Be contents of the residual melt. Muscovite increases the Li content of the melt and has little influence on F and Be concentrations. Our experiments reproduce mica assemblages and compositions typical of Variscan pegmatites and leucogranites, yet very Li-rich micas (e.g., lepidolites) were not obtained. The results stress the differential influence of fO2 on mica stability in moderately and highly fractionated crustal melts. Mica crystallization in leucogranites does not appear to be strongly dependent on fO2. In contrast, a very strong influence of fO2 on stable mica assemblages is demonstrated for the pegmatitic melt. The reducing experiments emphasize the existence of a stability field for biotite in melts poor in Fe, Mg, and Ti. If fO2 is reducing, biotite must crystallize in moderately to highly evolved peraluminous crustal melts. In contrast, the crystallization of muscovite as the sole mica in evolved crustal melts constitutes an indicator of oxidizing fO2. Such an oxidizing evolution that deviates from classical buffered T-logfO2 trajectories is the consequence of a mechanism of magma "self-oxidation" that is proposed to result from dissociation of H2O in the melt.
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.1500079
      Issue No: Vol. 54, No. 3 (2017)
  • Sodalite-Group Minerals From the Somma-Vesuvius Volcano (Naples, Italy): A
           Combined EPMA, SIMS, and FTIR Crystal-Chemical Study
    • Authors: Balassone, G; Bellatreccia, F, Ottolini, L, Mormone, A, Petti, C, Ghiara, M. R, Altomare, A, Saviano, M, Rizzi, R, D'orazio, L.
      Pages: 583 - 604
      Abstract: This work is focused on the crystal-chemical characterization of the cationic and anionic components of sodalite-group minerals (SGM) occurring in various igneous-to-metamorphic rocks and ejecta from the alkaline-potassic Somma-Vesuvius volcano (southern Italy). A combination of different analytical techniques, i.e., XRD, SEM, EPMA, SIMS, FTIR, and μ-FTIR-FPA imaging, were used. Minor and trace volatile elements (H, C, and F) have been quantified for the first time (to the authors' knowledge) by SIMS, and in situ ion probe data were integrated with information derived from FTIR spectroscopy.The studied samples correspond to sodalite sensu stricto, nosean, and haüyne. SIMS measurements for H, F, and C (quantified as H2O, F, and CO2 wt.%, respectively) show contents 0.02–5.0 wt.% H2O, 0.01–0.14 wt.% F, and 0.08–2.95 wt.% CO2. Within the single crystals, the F and, to a lesser extent, CO2 concentrations are homogeneous, whereas, in terms of H2O, they range from relatively homogenous to strongly zoned. Single-crystal FTIR spectra of SGM can be grouped into sodalites and noseans/haüynes, according to the occurrence of the 12CO2 absorption at 2340 cm–1. The absorption due to H2O or OH groups occurs as a very broad band extending from 3700 to 3000 cm–1. FTIR data show the presence of CO32– in all samples. The collected data allow us to fully characterize the SGM from Somma-Vesuvius, and also provide some constraints regarding their genesis. These data can contribute to a more detailed understanding of the crystal chemistry of SGM, their geological environments of formation, and possibly of the technological characteristics of their synthetic analogues.
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.1500083
      Issue No: Vol. 54, No. 3 (2017)
  • Do Magnetite Layers In Algoma-Type Banded Iron Formations (BIF) Preserve
           Their Primary Geochemical Signature? A Case Study of Samples From Three
           Archean BIF-Hosted Gold Deposits
    • Authors: Gourcerol, B; Kontak, D. J, Thurston, P. C, Duparc, Q.
      Pages: 605 - 624
      Abstract: The geochemistry of chert layers in Algoma-type banded iron formations (BIF) has been used to constrain the depositional setting of the BIFs, as rare earth element (REE) and yttrium (Y) systematics are a function of their chemical environment of formation. In contrast, the chemistry of the interbedded oxide-rich layers (i.e., magnetite) has not been analyzed for this purpose because of the presumed potential effects related to diagenetic changes during conversion from primary iron-bearing mineralogy to magnetite. Here, we explore the validity of this latter hypothesis by examining the results of LA-ICP-MS analysis of iron-oxide layers at three Canadian BIF-hosted gold deposits (i.e., Meadowbank, Meliadine, Musselwhite) to assess whether the primary REE+Y systematics of the oxide layers are preserved and, if so, what are the implications. The results indicate that, regardless of their diagenetic, later metamorphic, and hydrothermal histories, the chemistry of the iron oxides retains a primary signal in all cases with the following indicated: (1) interaction of the primary Fe-oxyhydroxide phases with seawater, as reflected by heavy REE enrichment relative to light REE depletion that is coupled with variable La and Y enrichment; and (2) some input of moderate-temperature (>250 °C) hydrothermal vent fluids, as suggested by positive Eu anomalies. The chemical data are also used to evaluate currently used classification diagrams for ore deposits based on magnetite chemistry. Our new data indicate that the fields for magnetite geochemistry in BIF are too restricted or lead to misclassification of samples. In the case of the latter, it may be that interaction of fluids with the immediate substrate influences the chemical signature of samples. Therefore, caution is suggested in using these diagrams where hydrothermal fluids are involved in magnetite formation.
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.1500090
      Issue No: Vol. 54, No. 3 (2017)
  • Raygrantite, Pb10Zn(SO4)6(SiO4)2(OH)2, A New Mineral Isostructural With
           Iranite, From the Big Horn Mountains, Maricopa County, Arizona, Usa
    • Authors: Yang, H; Andrade, M. B, Downs, R. T, Gibbs, R. B, Jenkins, R. A.
      Pages: 625 - 634
      Abstract: A new mineral species, raygrantite, ideally Pb10Zn(SO4)6(SiO4)2(OH)2, has been found in the Big Horn Mountains, Maricopa County, Arizona, USA. Associated minerals are galena, anglesite, cerussite, lanarkite, leadhillite, mattheddleite, alamosite, hydrocerussite, caledonite, and diaboleite. Raygrantite crystals are bladed with striations parallel to the elongated direction (the c axis). Twinning (fish-tail type) is pervasive on (1 2 ). The mineral is colorless, transparent with white streak, and has a vitreous luster. It is brittle and has a Mohs hardness of ~3; cleavage is good on {120} and no parting was observed. The calculated density is 6.374 g/cm3. Optically, raygrantite is biaxial (+), with nα = 1.915(7), nβ = 1.981(7), n = 2.068(9), 2Vmeas = 76(2)°, and 2Vcalc = 85°. It is insoluble in water, acetone, or hydrochloric acid. An electron microprobe analysis yielded the empirical formula Pb2+9.81Zn2+0.93(S1.00O4)6(Si1.05O4)2(OH)2. Raygrantite is a new member of the iranite mineral group. It is triclinic, with space group P and unit-cell parameters a 9.3175(4), b 11.1973(5), c 10.8318(5) Å, α 120.374(2), β 90.511(2), 56.471(2)°, and V 753.13(6) Å3. Its crystal structure, refined to R1 = 0.031, is characterized by slabs that lie parallel to (120) of SO4 and SiO4 tetrahedra with ZnO4(OH)2 octahedra, held together by Pb2+ cations displaying a wide range of Pb–O bond distances. The discovery of raygrantite indicates that, in addition to complete OH–F and Cu–Zn substitutions, there is also a complete substitution between (CrO4)2– and (SO4)2– in the iranite group of minerals, pointing to the possible existence of a number of other (SO4)2–-bearing iranite-type phases yet to be found or synthesized.
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.1500058
      Issue No: Vol. 54, No. 3 (2017)
  • Coloration of Natural Zircon
    • Authors: Kempe, U; Trinkler, M, Poppl, A, Himcinschi, C.
      Pages: 635 - 660
      Abstract: Selected literature data and new results from our own spectroscopic studies using optical absorption, paramagnetic resonance, and Raman spectroscopy are used to give an overview of recent understanding of the coloration of natural zircon. Pure ZrSiO4 is colorless. Coloration is mainly related to point defects of the electron or hole type, although charge transfer mechanisms and crystal field-dependent internal electron transitions in f- and d-elements may sometimes also play a significant role.There is a common substitution of tetravalent zirconium by trivalent rare earth elements (REE) and yttrium which is frequently not compensated by phosphorus or other elements. As a result, hole defects are the dominant type of coloration centers in reddish and some rose natural zircon crystals. On the other hand, electron centers may be involved in coloration of common yellowish-brownish zircon which displays low REE and yttrium contents. These two coloration mechanisms are the most common in natural zircon.An unspecific absorption increasing steadily from the red to the blue part of the optical absorption spectrum may additionally affect zircon coloration. Color shades of grey, rose, and brown appearing with increasing intensity of this absorption feature may result. This optical characteristic, which is frequently observed in some zircons, is obviously related to the effects of radioactive irradiation and occurs in various types of zircon depending on their uranium and thorium contents.Sharp absorption lines caused by internal electron transitions of the f-f type related to U4+ or, less typically, to Er3+ and Nd3+ substituting for Zr4+, occur frequently in the optical absorption spectra of zircon. As a rule, they have no significant influence on the visible color. However, very high U4+ or Er3+ contents combined with strong absorption in the blue part of the spectrum may cause greenish coloration. Rarely, green zircon coloration also occurs as a result of various broad absorption bands located in the red part of the spectrum.Very high REE contents in some zircons are the most likely cause for a strong, absorption edge-like feature in the blue part of the optical absorption spectrum, resulting in a rarely observed intense yellow coloration. Blue zircon coloration is mostly artificially induced by heating, but sometimes also occurs in nature. Besides the increase in unspecific absorption causing greyish to brownish colors, there are no simple relationships between zircon coloration, radioactivity, and structural order (or degree of metamictization) of the crystal grains.
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.1500093
      Issue No: Vol. 54, No. 3 (2017)
  • Paragenesis and Composition of Tourmaline Types Along the P2 Fault and
           Mcarthur River Uranium Deposit, Athabasca Basin, Canada
    • Authors: Adlakha, E. E; Hattori, K.
      Pages: 661 - 679
      Abstract: The P2 fault, a 13 km-long steeply dipping reverse fault, is the main structural control of the McArthur River uranium deposit in the eastern Athabasca Basin, northern Saskatchewan, Canada. Three types of tourmaline were observed in the metasedimentary basement rocks along the P2 fault: early oxy-schörl [(Na0.470.37Ca0.16)(Fe2+1.30Al0.91Mg0.72Ti0.07)Al6(Si5.79Al0.21O18)(BO3)3OH3(O0.63OH0.29F0.08), where = vacancy] of metamorphic-anatectic origin, hydrothermal oxy-dravite [(Na0.57Ca0.230.18K0.02)(Mg1.93Fe2+0.62Al0.29Ti0.15)Al6(Si5.93Al0.07O18)(BO3)3OH3(O0.57OH0.23F0.20)], and magnesio-foitite [(0.77Na0.20Ca0.02K0.01)(Mg1.99Al0.92Fe3+0.07)Al6(Si6O18)(BO3)3(OH3)(OH0.71O0.25F0.04)]. Oxy-schörl formed in granitic pegmatites, a partial melt product of the metasediments during peak metamorphism. Oxy-dravite formed from hydrothermal fluids after the peak metamorphism but before deposition of the Athabasca sandstones, whereas magnesio-foitite is a product of later, low-temperature hydrothermal activity. Both oxy-schörl and oxy-dravite are coarse-grained (from 500 μm up to 1 cm), whereas magnesio-foitite occurs as radial aggregates of fine, prismatic crystals (
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.1500057
      Issue No: Vol. 54, No. 3 (2017)
  • Supergene Alteration In the Capricornio AU-AG Epithermal Vein System,
           Antofagasta Region, Chile
    • Authors: Arfe, G; Boni, M, Mondillo, N, Aiello, R, Balassone, G, Arseneau, V, Soyk, D.
      Pages: 681 - 706
      Abstract: The Capricornio epithermal Au-Ag vein system is located within the Chilean Paleocene–Eocene metallogenic belt, 60 km ENE of Antofagasta in the physiographic Central Depression, between the Coastal Cordillera and the Domeyko Cordillera. Gold-silver mineralization occurs in multiple epithermal quartz-adularia-carbonate mineral veins, which extend from the surface down to ~400 m depth. The veins are hosted in Cretaceous volcanic rocks belonging to the Paradero del Desierto Formation. The hypogene ore association at Capricornio is represented by Au-Ag alloy ("electrum", containing on average 60 wt.% Au), Ag-sulfoarsenides, Ag-sulfoselenides, Ag-sulfoantimonides, Ag-sulfosalts, and acanthite, as well as by base metal sulfide minerals including galena, pyrite, chalcopyrite, sphalerite, and bornite. The hypogene mineralization is deeply weathered down to 200 m. The surficial oxidized blanket (0–150 m depth) is underlain by a secondary covellite-chalcocite-bearing zone, which exhibits a variable thickness up to 50 m in each of the veins. In the oxidized zone base metal sulfides have been replaced by several other metallic minerals: (oxy-hydroxy) chlorides (atacamite, pseudoboleite, cumengeite, herbertsmithite), chlorocarbonates (phosgenite), chloroiodates (seeligerite), chlorophosphates (pyromorphite), chloroarsenates (mimetite), and halides (iodargyrite). In this zone Au still occurs as "electrum", but after the remobilization of Ag during the process of supergene alteration it is slightly enriched in Au (up to a maximum of 78 wt.% Au) and occurs together with Fe-oxy-hydroxides. Gold has also been locally re-mobilized and may occur as veinlets of native Au. The major Ag-bearing mineral in the supergene zone is iodargyrite. The abundance of Ag-halide minerals, together with the higher Au contents of "electrum" in this zone (compared with that in the hypogene zone) suggests a weathering-related Ag remobilization. Silver was not leached from the deposit and was locally re-precipitated as Ag-oxidized compounds. The abundance of Ag-halide minerals in the uppermost part of the supergene zone suggests a large availability of halide ligands during weathering. This is expected, since Cu- and Ag-halide minerals commonly occur in the supergene weathering zones of porphyry Cu deposits in the Atacama region.
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.1600012
      Issue No: Vol. 54, No. 3 (2017)
  • Refinement of the Crystal Structure of Schneiderhohnite
    • Authors: Cooper, M. A; Hawthorne, F. C.
      Pages: 707 - 713
      Abstract: The crystal structure of schneiderhöhnite, Fe2+Fe3+3As3+5O13, triclinic P , a 8.945(3), b 10.022(3), c 9.161(4) Å, α 62.942(5), β 116.072(6), 81.722(6)°, has been refined to an R1 value of 1.4%. The structure is very close to that reported by Hawthorne (1985), but detailed examination of the structural connectivity shows that schneiderhöhnite is better described as a sheet structure than as a framework structure. Zig-zag chains of edge-sharing Fe(1), Fe(2), Fe(3) (= Fe3+) octahedra extend parallel to the c axis, and these chains are cross-linked into a corrugated sheet by tetramers of edge-sharing Fe(4) (= Fe3+) and Fe(5) (= Fe2+) octahedra. (As3+O3) triangular pyramids decorate the surface of this sheet of octahedra as single (AsO3) groups, with all three short bonds linked to anion vertices of the octahedra, and as two crystallographically distinct [As2O5] dimers with four short bonds (two from each As3+) to octahedron vertices. The sheets are connected along [100] via the bridging anion of one of the two [As2O5] dimers that bonds to an Fe2+ octahedron of the adjacent sheet, imparting a strong sheet-like character to the structure and accounting for the perfect (100) cleavage.
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.1500102
      Issue No: Vol. 54, No. 3 (2017)
  • Low-Salinity Liquid-Rich Or Vapor-Like Fluids In A Porphyry-Type Mo
           Deposit, South Korea
    • Authors: Kim, H; Yang, K, Lentz, D, Jeong, H.-Y, Kil, Y, Hwang, J, Park, S.-G.
      Pages: 715 - 736
      Abstract: Small porphyry-type molybdenum (Mo) mineralization, the Geumeum deposit in the Gyeongsang Basin, South Korea, is associated with the crystallization of a Cretaceous granodiorite, exsolution of magmatic hydrothermal fluids, and related hydrofracturing. Quartz and molybdenite occur with minor amounts of uneconomic chalcopyrite, pyrite, sphalerite, and galena that precipitated from exsolved magmatic fluids and formed hydrothermal fissure-filling vein ores. Three distinct fluid inclusion assemblages responsible for the precipitation of molybdenite are present in the vein quartz. The earliest fluid is represented by low-salinity liquid-rich Type I fluid inclusions, which displayed homogenization temperatures ranging from 298 to 352 °C, and salinities from ~0 to 9 wt.% NaCl equiv. The Type I inclusions were trapped in a liquid-stable, vapor-absent, one-phase field. The intermediate fluid is represented by CO2-bearing vapor-rich Type IV inclusions, generally showing no visible CO2 liquid phase. These CO2-bearing inclusions totally homogenized by vapor disappearance at 327~340 °C or vapor bubble expansion at 327~369 °C, exhibiting near-critical behaviors. The textural relationships and phase equilibria constraints indicate that the Type IV inclusions were derived from a single population, which formed as pressure and temperature fluctuated at near-critical conditions. The latest fluid can be represented by vapor-rich Type II fluid inclusions. No microthermometric data were obtained for these latest assemblages as no visible amounts of liquid phases are evident in small inclusions. Type III inclusions, which commonly refer to halite-bearing inclusions, are absent in the quartz veins studied. The oxygen and hydrogen isotopic fluid compositions of the vein quartz (18OSMOW = 4.3 to 6.9 and DSMOW = –65 to –84 at 400 °C) is consistent with a magmatic origin with a possible slight influence from meteoric water. Molybdenum mineralization at Geumeum is a product of hypogene hydrothermal processes that were strongly fracture-controlled, highlighting the importance of low-salinity liquid-rich to vapor-like supercritical fluids for the mineralization. It seems likely that the magmas responsible for the formation of the deposit at Geumeum were emplaced at greater depths than those reported for economic porphyry copper deposits in the world. The deposit could thus have survived long periods of erosion, and represent the weakly mineralized "base" of porphyry systems in the Gyeongsang Basin, South Korea.
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.1500008
      Issue No: Vol. 54, No. 3 (2017)
  • Identification of Fluid Inclusion Solid Phases Using A Focused Ion Beam
           Scanning Electron Microscope With Energy Dispersive Spectroscopy:
           Implications For Interpreting Microthermometric Data and Composition of
           Fluids In SN (-W-Mo) Deposits
    • Authors: Elmi Assadzadeh, G; Samson, I. M, Gagnon, J. E.
      Pages: 737 - 754
      Abstract: A feature of many granite-related mineral deposits is the presence of highly saline fluid inclusions that contain abundant daughter minerals, the identity and chemistry of which hold important information for the interpretation of the chemistry of mineralizing fluids in such environments. A focused ion beam (FIB) coupled with a scanning electron microscope (SEM) and energy-dispersive spectroscope (EDS) was used to identify daughter minerals within such fluid inclusions in fluorite from the Mount Pleasant Sn (-W-Mo-In) deposits, New Brunswick, Canada. The technique can be used to obtain quantitative compositional information for solid phases in fluid inclusions for which the optical properties have previously been studied, but whose identification remains equivocal. In addition, for solid-rich fluid inclusions, this technique enables identification of solids that are obscured by other solids and are not readily visible using optical microscopy. Methods such as Raman spectroscopy and SEM-EDS analysis of broken surfaces have limited success in mineral identification in these inclusions due to strong fluorescence in fluorite and an inability to correlate solids with their optical properties, respectively. The FIB-EDS analyses of the daughter minerals and precipitates formed by evaporation of the liquid in the inclusions show that the complex inclusions from Mount Pleasant contain brines with high concentrations of Na, Fe, K, Mn, Pb, Zn, and Cl; daughter minerals comprise halite and a variety of Fe-K(-Mn) chloride hydrates, and less frequently, Pb chlorides and Sn-bearing phases. The precipitates contain similar phases, although in general they are more K-rich than the daughter minerals. Unequivocal identification of most solid phases was not possible due to inaccuracies inherent in the FIB-EDS chemical analyses and a lack of Raman spectra for many K-Fe-Mn chloride hydrate minerals. Our data indicate that square ("cubic") solids in such inclusions are not always halite, and that misidentification of halite could result in erroneous salinity estimates, which could lead to inaccurate interpretations of fluid composition using techniques such as laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS).
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.1500065
      Issue No: Vol. 54, No. 3 (2017)
  • Supergene Alteration of Platinum-Group Minerals and the Formation of
           Pd-Cu-O and Pd-I-O Compounds In the Limoeiro Ni-Cu-(PGE) Deposit, Brazil
    • Authors: Mota-E-Silva, J; Prichard, H. M, Suarez, S, Ferreira Filho, C. F, Fisher, P. C.
      Pages: 755 - 778
      Abstract: The effects of weathering of platinum-group minerals (PGM) in the Limoeiro nickel-copper and platinum-group element [Ni-Cu-(PGE)] deposit reveal a progressive alteration of the abundant primary merenskyite, including neoformation of Pd-Cu±Bi rosettes and a rare I-rich PGM in the supergene reaction front of the deposit. Pyrrhotite with smaller equal proportions of chalcopyrite and pentlandite and minor PGM are typical of the fresh ore assemblage in the primary deposit. Weathering has produced a ~3 m thick gossan cap over the base metal sulfide-rich parts of the Limoeiro primary ore. The mobility of Pt is very dependent on whether it is trapped in arsenide (sperrylite), which is very durable, or in bismuthotellurides (i.e., merenskyite–moncheite–melonite solid solution series), which break down more easily. The weathering over the Limoeiro deposit was not intense enough to overcome the pH- and redox-buffering capacity of the underling harzburgite and consequently Pd has not been leached, transported, or dispersed more than at a millimeter-scale. As a result, the Pt/Pd ratio of ~0.4 remains roughly constant from the fresh ore at depth to the gossan on the surface. Weathering effects are apparent as deep as ~50 m with the oxidation of pentlandite and pyrrhotite to produce violarite and pyrite, respectively. Chalcopyrite is more stable, beginning to alter at a depth of around 20 m. The PGM start to alter at a depth of ~25 m where merenskyite becomes Pd-rich because much of the Te has been released into the adjacent goethite. With progressively more weathering towards the surface the merenskyite appears partially dissolved and pseudomorphed by goethite, which is often coated with newly formed Pd-Cu±Bi rosettes. A proportion of the remobilized Pd has precipitated as small (
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.1500049
      Issue No: Vol. 54, No. 3 (2017)
  • The Hawley Medal For 2014 To Fernando G. Sardi and Adriana Heimann
    • Pages: 779 - 780
      Abstract: The Hawley Medal is awarded to the authors of the best paper to appear in The Canadian Mineralogist in a given year. The award is named in honor of Dr. J.E. Hawley (1897–1965) who was distinguished professor of mineralogy at Queen's University. The paper is selected by a committee of three members selected by the Chair of the Nominating Committee.The following paper has won this prestigious award for the best paper published in 2014:"PEGMATITIC BERYL AS INDICATOR OF MELT EVOLUTION: EXAMPLE FROM THE VELASCO DISTRICT, PAMPEANA PEGMATITE PROVINCE, ARGENTINA, AND REVIEW OF WORLDWIDE OCCURRENCES"Canadian Mineralogist 52(5), 809–836.
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.A00001
      Issue No: Vol. 54, No. 3 (2017)
  • The Peacock Medal For 2015 To Donald Bruce Dingwell
    • Pages: 781 - 783
      Abstract: The Peacock Medal, the highest award bestowed by the Mineralogical Association of Canada, is awarded to Donald Bruce Dingwell of the Ludwig Maximilian University of Munich for his outstanding contributions to the mineral sciences.
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.A00002
      Issue No: Vol. 54, No. 3 (2017)
  • The Young Scientist Award For 2015 To Gordon R. Osinski
    • Pages: 785 - 786
      Abstract: The Young Scientist Award is given to a young scientist who has made a significant international research contribution in a promising start to a scientific career. This year's awardee is Gordon R. Osinski, an associate professor and the NSERC/MDA/CSA Industrial Research Chair in Planetary Geology in the Departments of Earth Sciences and Physics and Astronomy at the University of Western Ontario, Canada.
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.A00003
      Issue No: Vol. 54, No. 3 (2017)
  • The Berry Medal For 2015 To Martine M. Savard
    • Pages: 787 - 788
      Abstract: The MAC recognizes the long-term dedication of individuals to our association through awarding of the Berry Medal (named after Len Berry, a professor of mineralogy at Queen's University in Kingston, Ontario, and Editor of The Canadian Mineralogist from 1955 until 1975). This year's winner is Martine M. Savard, Research Geoscientist at the Geological Survey of Canada (GSC).
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.A00004
      Issue No: Vol. 54, No. 3 (2017)
  • Book Review
    • Authors: Martin; R. F.
      Pages: 789 - 790
      PubDate: 2017-04-04T18:24:30-07:00
      DOI: 10.3749/canmin.BR00002
      Issue No: Vol. 54, No. 3 (2017)
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