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  Subjects -> CHEMISTRY (Total: 891 journals)
    - ANALYTICAL CHEMISTRY (54 journals)
    - CHEMISTRY (620 journals)
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CHEMISTRY (620 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 14)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Hybrid Journal   (Followers: 43)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 21)
ACS Combinatorial Science     Hybrid Journal   (Followers: 23)
ACS Macro Letters     Hybrid Journal   (Followers: 25)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 41)
ACS Nano     Hybrid Journal   (Followers: 277)
ACS Photonics     Hybrid Journal   (Followers: 14)
ACS Symposium Series     Full-text available via subscription  
ACS Synthetic Biology     Hybrid Journal   (Followers: 24)
Acta Chemica Iasi     Open Access   (Followers: 5)
Acta Chimica Slovaca     Open Access   (Followers: 2)
Acta Chimica Slovenica     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7)
Acta Scientifica Naturalis     Open Access   (Followers: 3)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 7)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 9)
Adsorption Science & Technology     Open Access   (Followers: 6)
Advanced Functional Materials     Hybrid Journal   (Followers: 57)
Advanced Science Focus     Free   (Followers: 5)
Advances in Chemical Engineering and Science     Open Access   (Followers: 67)
Advances in Chemical Science     Open Access   (Followers: 18)
Advances in Chemistry     Open Access   (Followers: 21)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 19)
Advances in Drug Research     Full-text available via subscription   (Followers: 24)
Advances in Environmental Chemistry     Open Access   (Followers: 5)
Advances in Enzyme Research     Open Access   (Followers: 10)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 9)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 11)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 25)
Advances in Nanoparticles     Open Access   (Followers: 15)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 16)
Advances in Polymer Science     Hybrid Journal   (Followers: 43)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 20)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Science and Technology     Full-text available via subscription   (Followers: 12)
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 3)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 65)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 20)
American Journal of Chemistry     Open Access   (Followers: 30)
American Journal of Plant Physiology     Open Access   (Followers: 11)
American Mineralogist     Hybrid Journal   (Followers: 15)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 163)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 240)
Annales UMCS, Chemia     Open Access  
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 5)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 4)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 9)
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: 13)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal   (Followers: 2)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 9)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Surface Science     Hybrid Journal   (Followers: 31)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 2)
Atomization and Sprays     Full-text available via subscription   (Followers: 4)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
Avances en Quimica     Open Access  
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Hybrid Journal   (Followers: 350)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 10)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 2)
Biomacromolecules     Hybrid Journal   (Followers: 21)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 7)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 5)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 130)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 86)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 2)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
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: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 6)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 70)
Catalysis for Sustainable Energy     Open Access   (Followers: 8)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 10)
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: 19)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 73)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 26)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 22)
Chemical Reviews     Hybrid Journal   (Followers: 187)
Chemical Science     Open Access   (Followers: 24)
Chemical Technology     Open Access   (Followers: 26)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 55)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 24)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Biology     Full-text available via subscription   (Followers: 32)
Chemistry & Industry     Hybrid Journal   (Followers: 7)
Chemistry - A European Journal     Hybrid Journal   (Followers: 158)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 16)
Chemistry and Materials Research     Open Access   (Followers: 21)
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     Hybrid Journal   (Followers: 252)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 19)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 1)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 4)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 12)
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: 11)
Chromatographia     Hybrid Journal   (Followers: 24)
Chromatography     Open Access   (Followers: 2)
Chromatography Research International     Open Access   (Followers: 6)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Cogent Chemistry     Open Access   (Followers: 1)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 11)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 6)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 22)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Communications Chemistry     Open Access  
Composite Interfaces     Hybrid Journal   (Followers: 7)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 1)
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: 10)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 3)
Copernican Letters     Open Access   (Followers: 1)
Corrosion Series     Full-text available via subscription   (Followers: 6)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 6)
Croatica Chemica Acta     Open Access  
Crystal Structure Theory and Applications     Open Access   (Followers: 4)
CrystEngComm     Full-text available via subscription   (Followers: 13)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Chromatography     Hybrid Journal  
Current Green Chemistry     Hybrid Journal  
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Microwave Chemistry     Hybrid Journal  
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Opinion in Molecular Therapeutics     Full-text available via subscription   (Followers: 14)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 69)
Current Trends in Biotechnology and Chemical Research     Open Access   (Followers: 3)
Dalton Transactions     Full-text available via subscription   (Followers: 23)
Detection     Open Access   (Followers: 2)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  

        1 2 3 4 | Last

Journal Cover
Canadian Mineralogist
Journal Prestige (SJR): 0.565
Citation Impact (citeScore): 1
Number of Followers: 6  
 
  Full-text available via subscription Subscription journal
ISSN (Print) 0008-4476 - ISSN (Online) 1499-1276
Published by GeoScienceWorld Homepage  [15 journals]
  • An IN SITU Kinetic Study of the Dehydration of Brucite Using Synchrotron
           X-ray Powder Diffraction
    • Authors: Liu C; Zhang R, Shen K, et al.
      Abstract: The dehydration kinetics of brucite were studied in situ by synchrotron X-ray powder diffraction (XRPD) in the temperature range 320–370 °C. The sequence of XRD spectra clearly reveals that the phase transformation of brucite into periclase occurs with increasing temperature up to 600 °C under ambient pressure. Our results show that there is a positive temperature dependence of the reaction rate k. Elevated temperatures will be conducive to the dehydration process. The obtained n values suggest that the reaction mechanism is a one-dimensional diffusion of the water molecules with an instantaneous nucleation. The influence of temperature on the reaction rate is well described by the Arrhenius equation, which yields an apparent activation energy Ea of 386 ± 12 kJ/mol and frequency factor A of 1.14 × 1029 s–1. The activation energy is influenced by factors such as grain size, shape, temperature, gas atmosphere, and surrounding water.
      PubDate: Tue, 30 Jan 2018 00:00:00 GMT
       
  • Remembering Dr. Kurt Kyser
    • Authors: Hiatt E; Pufahl P, Peterson R.
      PubDate: Tue, 30 Jan 2018 00:00:00 GMT
       
  • Origin and Evolution of Oscillatory Zoned Garnet from Kasva Skarn,
           Northeast Tafresh, Iran
    • Authors: Mirnejad H; Hasannejad M, Miller N, et al.
      Abstract: Within the central Urumieh-Dokhtar Magmatic Belt of northern Iran, the Kasva skarn deposit (KSD) formed by metasomatic alteration of Eocene intercalated carbonate and volcaniclastic sediments in response to Oligo-Miocene intrusion by granitoid porphyries. The KSD contains abundant oscillatory-zoned garnet crystals, which are characterized by isotropic cores of nearly pure andradite that are rimmed by anisotropic grossular–andradite (grandite). The Fe-rich andraditic cores are enriched in U and LREE, with positive Eu anomalies, whereas the Al-rich granditic rims are enriched in Ti, Nb, Zr, Hf, and HREE, without Eu anomalies. Variation in optical and chemical features in Fe- and Al-rich garnet are controlled by external factors such as (1) infiltration of compositionally distinct fluids, (2) incorporation of LREE and U at the {X} site in association with substitution of Fe3+ for Al3+ at [Y] within the crystal structure of andraditic garnet, and (3) substitution of Ti and HFSE for Al in granditic garnet.
      PubDate: Tue, 30 Jan 2018 00:00:00 GMT
       
  • Redefinition of Zircophyllite, Ideally K 2 NaMn 7 Zr 2 (Si 4 O 12 ) 2 O 2
           (OH) 4 F, a Kupletskite-group Mineral of the Astrophyllite Supergroup (in
           Accord with Ima 15-b) As an Astrophyllite-group Mineral, Ideally K 2 NaFe
           2+ 7 Zr 2 (Si 4 O 12 ) 2 O 2 (OH) 4 F (ima 17-d)
    • Authors: Sokolova E; CÁmara F, Hawthorne FC, et al.
      Abstract: Zircophyllite is redefined as an astrophyllite-group mineral, ideally K2NaFe2+7Zr2(Si4O12)2O2(OH)4F (Fe2+-dominant at C7) (IMA 17-D). Zircophyllite was previously considered to be a kupletskite-group mineral of the astrophyllite supergroup (Mn2+-dominant at C7), with ideal formula K2NaMn7Zr2(Si4O12)2O2(OH)4F (IMA 15-B). The latter formula is not in agreement with that reported in the original description of zircophyllite.
      PubDate: Tue, 30 Jan 2018 00:00:00 GMT
       
  • Application of La-icp-ms Sulfide Analysis and Methodology For Deciphering
           Elemental Paragenesis and Associations in Addition To Multi-stage
           Processes in Metamorphic Gold Settings
    • Authors: Gourcerol B; Kontak DJ, Thurston PC, et al.
      Abstract: Quantitative laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS) element distribution analysis represents a relatively new and powerful approach to assess gold mineralizing processes. Although there is a trend towards imaging in LA-ICP-MS, this article demonstrates that the compilation of the individual time-slice datasets (TSD) from LA analyses provides greater potential to explore and better understand ore systems. Based on several analyses of gold-bearing sulfides from a variety of lode gold mineralized settings, this study introduces new diagrams and geostatistical techniques as recommended procedures to be applied to any gold deposit environment to better understand its genesis, with possible exploration implications. The nature of the mineralizing fluid is investigated by studying Ni and Co variations in the sulfide grains in environments ranging from ultramafic to felsic, whereas upgrading of gold tenor within an ore deposit is identified using Au versus Ag plots grouped by element association and elemental geochemical affinity. Furthermore, the textural transformation and coupled dissolution/precipitation (CDP) in pyrite is documented using Ag versus Ni plots with associated defined fields (i.e., diagenetic versus metamorphic). Lastly, standard geostatistical tests are used to assess element associations through agglomerative hierarchical clustering and exploratory statistical methods. Meanwhile, a multidimensional scaling approach can evaluate the geochemical affinity of the mineralizing fluids.
      PubDate: Tue, 30 Jan 2018 00:00:00 GMT
       
  • Characterization of Fibrous Cryptomelane from the Todorokite-cryptomelane
           Mineral Assemblage At the Sebilo Mine, Northern Cape Province, South
           Africa
    • Authors: Vafeas N; Viljoen KS, Blignaut L.
      Abstract: A 30-cm hand sample was obtained from the lowermost manganese ore bed, directly below the Kalahari unconformity within the supergene zone, at the Sebilo manganese mine in the Kalahari Manganese Field, Northern Cape Province, South Africa. The sample comprises an intergrowth of rare supergene fibrous cryptomelane and todorokite, as well as traces of pre-supergene manganese oxides. A chemical analysis of hausmannite concretions within remnant diagenetic manganese ore fragments in the supergene mineral assemblage shows leaching of pre-existing carbonate and silicate compounds from the primary diagenetic ore (Kleyenstüber 1984, 1985, Chetty 2008, Vafeas 2016) via descending meteoric fluids along the Kalahari unconformity. This resulted in the initial development of todorokite, forming the bulk of the matrix, and the coeval development of early-stage calcite within the todorokite pores. Subsequent to this, late-stage calcite precipitated from descending Ca-bearing supergene fluids and is seen to superimpose the todorokite matrix. Growth of the supergene mineral assemblage ended with the formation of rare medium- and coarse-grained acicular cryptomelane crystals that are orientated perpendicular to the host fracture surface.
      PubDate: Tue, 30 Jan 2018 00:00:00 GMT
       
  • Investigation of the Structural Stability of Zippeite-group Minerals Using
           High-temperature Calorimetry
    • Authors: Sharifironizi M; Burns PC.
      Abstract: Accurate thermodynamic data for uranyl minerals are needed to understand their role in uranium deposit formation and subsequent alteration, transport of uranium in contaminated subsurface environments, and for predicting the performance of a geological repository for nuclear waste. Three members of the uranyl sulfate zippeite group, natrozippeite, cobaltzippeite, and zinczippeite, were synthesized and characterized prior to determination of their standard state enthalpies of formation from binary oxides and from elements using high-temperature drop-solution calorimetry. Calculated standard-state enthalpies of formation from the elements, ΔHf°, at 298 K, were found to be –18015.84 ± 28.76, –4362.09 ± 10.44, and –4698.22 ± 13.68 kJ/mol for natrozippeite (Na5[(UO2)8(SO4)4O5(OH)3]•12H2O), cobaltzippeite (Co[(UO2)2(SO4)O2]•3.7H2O), and zinczippeite (Zn[(UO2)2(SO4)O2]•4.1H2O), respectively. Current results, together with the standard-state enthalpy of formation value for zippeite (containing K) reported earlier, allows investigation of the role of acid-base interactions between the structural unit and interstitial complexes relative to the enthalpy of formation of zippeite-group minerals. There is a positive linear relationship between the formation enthalpies from oxides and the acidity of cation oxides. There is also a linear correlation between the ionic radius of charge-balancing alkali cations and the enthalpy of formation of the studied compounds from their binary oxides, indicating the importance of the nature and coordination environment of the interstitial complex in determining the thermodynamic properties of these minerals.
      PubDate: Tue, 30 Jan 2018 00:00:00 GMT
       
  • The Crystal-chemistry of Ni-bearing Spinel-group Minerals: Chemical,
           Geological, and Exploration Implications
    • Authors: Beckett-Brown CE; McDonald AM.
      Abstract: Spinels with Ni contents ranging from 196 ppm to 12.85 wt.%, obtained from intermediate-mafic to ultramafic environments (Morokweng crater and Bon Accord, South Africa; Puddy Lake, Ontario, Canada), have been studied using textural observations and in situ chemical analyses (e.g., energy and wavelength dispersive spectroscopy as well as laser-ablation inductively-coupled mass-spectrometry) to document and highlight the significance of Ni incorporation into spinel-group minerals. Those from the Puddy Lake ultramafic intrusion have the lowest Ni concentrations, ranging from 196 to 7880 ppm (avg. = 3326, n = 37). They develop in heavily serpentinized areas of the intrusion as isolated, optically zoned subhedral to anhedral crystals up to 1 mm in diameter. Chemically, they range from Ni-bearing chromite to Ni-bearing magnetite with an average composition of (based on 4 anions): (Fe2+0.80Mg2+0.13Mn2+0.05Ni2+0.02Zn2+0.01)Σ1.01(Cr3+1.28Fe3+0.38Al3+0.32Ti0.01)Σ1.99O4 and (Fe2+0.88Mg2+0.08Ni2+0.02Mn2+0.01Zn2+0.01)Σ1.00(Fe3+1.84Cr3+0.16)Σ2.00O4, respectively. Spinels from the quartz-norite melt sheet of the Morokweng impact crater have intermediate Ni concentrations ranging from 0.41 to 7.29 wt.% (avg. = 5.00, n = 81). They develop as anhedral rounded grains (∼25 μm in diameter) that surround disseminated sulfide patches (∼5 cm in diameter), the latter composed of millerite, siegenite, and chalcopyrite. Chemically, these spinels are Ni-bearing (<5.00 wt.% Ni) to Ni-rich (<12.52–5.00 wt.% Ni) magnetite, with an average composition of (Fe2+0.77Ni2+0.23)Σ1.00(Fe3+2.00)Σ2.00O4. Spinel from the Bon Accord ultramafic hosted nickel-oxide showing contain the highest Ni concentrations, ranging from 10.19 to 12.85 wt.% (avg. = 11.54, n = 50). They form as solitary subhedral grains (∼50 to 100 μm in diameter) or as aggregates of multiple grains (ranging from 0.5 to 1.0 cm), some containing inclusions of Ni-rich silicates (e.g., willemseite) and sulfides (e.g., millerite). Chemically, they are compositionally intermediate between magnetite and trevorite, with an average composition of (Fe2+0.54Ni2+0.46)Σ1.00(Fe3+1.99)Σ1.99O4. Nickel incorporation in spinel-group minerals appears to be process dependent, with no universal control on its incorporation. In general, the greatest Ni enrichment is observed in inverse spinel-group minerals (i.e., magnetite) due to site-preference energy constraints.
      PubDate: Tue, 30 Jan 2018 00:00:00 GMT
       
  • The Ericssonite Group of Fe 3+ Disilicate Minerals
    • Authors: Sokolova E; Hawthorne FC, CÁmara F, et al.
      Abstract: The ericssonite group contains two Fe3+ disilicates with the ericssonite structure-type arrangement: ericssonite, BaMn2Fe3+(Si2O7)O(OH), and ferroericssonite, BaFe2+2Fe3+(Si2O7)O(OH) (Memorandum 78-SM/17). Ericssonite has two polytypes, of monoclinic symmetry and orthorhombic symmetry. The crystal chemistry of the ericssonite-group minerals and bafertisite- and lamprophyllite-group minerals (seidozerite supergroup) is compared. Ericssonite and ferroericssonite do not contain the combination of features that would allow them to belong to any group of the seidozerite supergroup and hence require a completely separate group.
      PubDate: Tue, 30 Jan 2018 00:00:00 GMT
       
 
 
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