Coulsonite FeV2O4—A Rare Vanadium Spinel Group Mineral in Metamorphosed Massive Sulfide Ores of the Kola Region, Russia
| Autor: | Alena A. Kompanchenko |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
spinel group mineral lcsh:QE351-399.2 010504 meteorology & atmospheric sciences Sulfide Vanadium chemistry.chemical_element engineering.material 010502 geochemistry & geophysics 01 natural sciences massive sulfide ore Spinel group Chemical composition Kola region 0105 earth and related environmental sciences chemistry.chemical_classification Mineral lcsh:Mineralogy Metallurgy Geology Geotechnical Engineering and Engineering Geology Paleoproterozoic coulsonite chemistry Rutile metamorphism engineering vanadium Chromite Ilmenite |
| Zdroj: | Minerals, Vol 10, Iss 843, p 843 (2020) Minerals Volume 10 Issue 10 |
| Popis: | This work presents new data on a rare vanadium spinel group mineral, i.e., coulsonite FeV2O4 established in massive sulfide ores of the Bragino occurrence in the Kola region, Russia. Coulsonite in massive sulfide ores of the Bragino occurrence is one of the most common vanadium minerals. Three varieties of coulsonite were established based on its chemical composition, some physical properties, and mineral association: coulsonite-I, coulsonite-II, and coulsonite-III. Coulsonite-I forms octahedral crystal clusters of up to 500 µ m, and has a uniformly high content of Cr2O3 (20&ndash 30 wt.%), ZnO (up to 4.5 wt.%), and MnO (2.8 wt.%), high microhardness (743 kg/mm2) and coefficient of reflection. Coulsonite-II was found in relics of quartz&ndash albite veins in association with other vanadium minerals. Its features are a thin tabular shape and enrichment in TiO2 of up to 18 wt.%. Coulsonite-III is the most common variety in massive sulfide ores of the Bragino occurrence. Coulsonite-III forms octahedral crystals of up to 150 µ m, crystal clusters, and intergrowths with V-bearing ilmenite, W-V-bearing rutile, Sc-V-bearing senaite, etc. Chemical composition of coulsonite-III is characterized by wide variation of the major compounds&mdash Fe, V, Cr. In some crystals of coulsonite-III, relics of chromite are observed. The microhardness of coulsonite-III is 577 kg/mm2, the reflection coefficient changes in relation to iron, vanadium, and chromium content. |
| Databáze: | OpenAIRE |
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