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Topaz Mineral Data
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General Topaz Information
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 Chemical Formula: |
Al2SiO4(F,OH)2 |
| Composition: |
Molecular Weight = 182.25 gm |
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Aluminum 29.61 % Al 55.95 % Al2O3 |
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Silicon 15.41 % Si 32.97 % SiO2 |
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Hydrogen 0.50 % H 4.45 % H2O |
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Oxygen 43.02 % O |
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Fluorine 11.47 % F 11.47 % F |
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- %
F -4.83 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Al2(SiO4)F1.1(OH)0.9 |
| Environment: |
Pegmatites and high temperature quartz veins. Cavities in granites and rhyolites. Deposited by fluorine-rich vapors in rocks of rhyolite composition. |
| IMA Status: |
Valid Species (Pre-IMA) Prehistoric |
| Locality: |
Topasos Island in the Red Sea. Link to MinDat.org Location Data. |
| Name Origin: |
Named after its locality. |
| Name Pronunciation: |
Topaz  |
| Synonym: |
Pycnite - yellowish white- |
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