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Tokkoite Mineral Data
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General Tokkoite Information
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 Chemical Formula: |
K2Ca4[Si7O18(OH)](F,OH) |
| Composition: |
Molecular Weight = 758.60 gm |
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Potassium 10.31 % K 12.42 % K2O |
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Calcium 21.13 % Ca 29.57 % CaO |
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Silicon 25.92 % Si 55.44 % SiO2 |
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Hydrogen 0.17 % H 1.48 % H2O |
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Oxygen 40.60 % O |
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Fluorine 1.88 % F 1.88 % F |
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- %
F -0.79 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
K2Ca4Si7O18(OH)1.25F0.75 |
| IMA Status: |
Approved IMA 1986 |
| Locality: |
Murun massif, between the Charo and Tokko rivers, Yakutia, Russia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Tokkoite  |
| Synonym: |
ICSD 67211 |
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PDF 40-517 |
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