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Fersmite Mineral Data
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General Fersmite Information
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 Chemical Formula: |
(Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 |
| Composition: |
Molecular Weight = 390.96 gm |
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Sodium 0.59 % Na 0.79 % Na2O |
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Calcium 7.18 % Ca 10.04 % CaO |
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Cerium 7.17 % Ce 8.40 % Ce2O3 |
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Yttrium 2.27 % Y 2.89 % Y2O3 |
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Thorium 2.97 % Th 3.38 % ThO2 |
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Tantalum 13.89 % Ta 16.95 % Ta2O5 |
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Titanium 0.24 % Ti 0.41 % TiO2 |
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Niobium 40.40 % Nb 57.79 % Nb2O5 |
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Hydrogen 0.26 % H 2.30 % H2O |
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Oxygen 24.55 % O |
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Fluorine 0.49 % F 0.49 % F |
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- %
F -0.20 % -O=F2 |
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______ ______ |
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100.00 % 103.23 % = TOTAL OXIDE |
| Empirical Formula: |
Ca0.7Ce0.2Y0.1Na0.1Th0.05Nb1.7Ta0.3Ti0.02O5(OH)F0.1 |
| Environment: |
Accessory mineral in nepheline syenites and carbonatites. |
| IMA Status: |
Valid Species (Pre-IMA) 1946 |
| Locality: |
Lake Buldym, Vishnevy-Ilmen Mountains, Southern Ural Mountains, Russia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Aleksandr Evgenevich Fersman (1883-1945), eminent Russian mineralogist, geochemist, and gemologist. |
| Name Pronunciation: |
Fersmite  |
| Synonym: |
ICSD 77474 |
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PDF 39-1392 |
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