Coulsonite FeV<sub>2</sub>O<sub>4</sub>—A Rare Vanadium Spinel Group Mineral in Metamorphosed Massive Sulfide Ores of the Kola Region, Russia
This work presents new data on a rare vanadium spinel group mineral, i.e., coulsonite FeV<sub>2</sub>O<sub>4</sub> 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...
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MDPI AG
2020-09-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/10/10/843 |
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| author | Alena A. Kompanchenko |
| author_facet | Alena A. Kompanchenko |
| author_sort | Alena A. Kompanchenko |
| collection | DOAJ |
| description | This work presents new data on a rare vanadium spinel group mineral, i.e., coulsonite FeV<sub>2</sub>O<sub>4</sub> 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 µm, and has a uniformly high content of Cr<sub>2</sub>O<sub>3</sub> (20–30 wt.%), ZnO (up to 4.5 wt.%), and MnO (2.8 wt.%), high microhardness (743 kg/mm<sup>2</sup>) and coefficient of reflection. Coulsonite-II was found in relics of quartz–albite veins in association with other vanadium minerals. Its features are a thin tabular shape and enrichment in TiO<sub>2</sub> 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 µm, 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—Fe, V, Cr. In some crystals of coulsonite-III, relics of chromite are observed. The microhardness of coulsonite-III is 577 kg/mm<sup>2</sup>, the reflection coefficient changes in relation to iron, vanadium, and chromium content. |
| first_indexed | 2024-03-10T16:05:05Z |
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| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T16:05:05Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-cfd9f68f11bc4a0186b7e18d0b4616da2023-11-20T14:59:11ZengMDPI AGMinerals2075-163X2020-09-01101084310.3390/min10100843Coulsonite FeV<sub>2</sub>O<sub>4</sub>—A Rare Vanadium Spinel Group Mineral in Metamorphosed Massive Sulfide Ores of the Kola Region, RussiaAlena A. Kompanchenko0Geological Institute of the Federal Research Centre “Kola Science Centre of the Russian Academy of Sciences”, 14 Fersman Street, 184209 Apatity, RussiaThis work presents new data on a rare vanadium spinel group mineral, i.e., coulsonite FeV<sub>2</sub>O<sub>4</sub> 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 µm, and has a uniformly high content of Cr<sub>2</sub>O<sub>3</sub> (20–30 wt.%), ZnO (up to 4.5 wt.%), and MnO (2.8 wt.%), high microhardness (743 kg/mm<sup>2</sup>) and coefficient of reflection. Coulsonite-II was found in relics of quartz–albite veins in association with other vanadium minerals. Its features are a thin tabular shape and enrichment in TiO<sub>2</sub> 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 µm, 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—Fe, V, Cr. In some crystals of coulsonite-III, relics of chromite are observed. The microhardness of coulsonite-III is 577 kg/mm<sup>2</sup>, the reflection coefficient changes in relation to iron, vanadium, and chromium content.https://www.mdpi.com/2075-163X/10/10/843spinel group mineralcoulsonitevanadiummassive sulfide oremetamorphismPaleoproterozoic |
| spellingShingle | Alena A. Kompanchenko Coulsonite FeV<sub>2</sub>O<sub>4</sub>—A Rare Vanadium Spinel Group Mineral in Metamorphosed Massive Sulfide Ores of the Kola Region, Russia Minerals spinel group mineral coulsonite vanadium massive sulfide ore metamorphism Paleoproterozoic |
| title | Coulsonite FeV<sub>2</sub>O<sub>4</sub>—A Rare Vanadium Spinel Group Mineral in Metamorphosed Massive Sulfide Ores of the Kola Region, Russia |
| title_full | Coulsonite FeV<sub>2</sub>O<sub>4</sub>—A Rare Vanadium Spinel Group Mineral in Metamorphosed Massive Sulfide Ores of the Kola Region, Russia |
| title_fullStr | Coulsonite FeV<sub>2</sub>O<sub>4</sub>—A Rare Vanadium Spinel Group Mineral in Metamorphosed Massive Sulfide Ores of the Kola Region, Russia |
| title_full_unstemmed | Coulsonite FeV<sub>2</sub>O<sub>4</sub>—A Rare Vanadium Spinel Group Mineral in Metamorphosed Massive Sulfide Ores of the Kola Region, Russia |
| title_short | Coulsonite FeV<sub>2</sub>O<sub>4</sub>—A Rare Vanadium Spinel Group Mineral in Metamorphosed Massive Sulfide Ores of the Kola Region, Russia |
| title_sort | coulsonite fev sub 2 sub o sub 4 sub a rare vanadium spinel group mineral in metamorphosed massive sulfide ores of the kola region russia |
| topic | spinel group mineral coulsonite vanadium massive sulfide ore metamorphism Paleoproterozoic |
| url | https://www.mdpi.com/2075-163X/10/10/843 |
| work_keys_str_mv | AT alenaakompanchenko coulsonitefevsub2subosub4subararevanadiumspinelgroupmineralinmetamorphosedmassivesulfideoresofthekolaregionrussia |