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Thermessaite Mineral Data
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General Thermessaite Information
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 Chemical Formula: |
K2[AlF3SO4] |
| Composition: |
Molecular Weight = 258.95 gm |
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Potassium 30.50 % K 36.74 % K2O |
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Aluminum 10.94 % Al 20.67 % Al2O3 |
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Sulfur 11.64 % S 29.06 % SO3 |
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Oxygen 23.66 % O |
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Fluorine 23.26 % F 23.26 % F |
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- %
F -9.79 % -O=F2 |
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______ ______ |
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100.00 % 99.94 % = TOTAL OXIDE |
| Empirical Formula: |
K2.02Al1.05F3.17S0.94O3.83 |
| Environment: |
Found as small colorless to white prismatic crystals in an active fumarole on the rim of the crater. |
| IMA Status: |
Approved IMA 2007 (Dana # Added) |
| Locality: |
La Fossa crater, Vulcano, Aeolian Islands, Italy. Link to MinDat.org Location Data. |
| Name Origin: |
Named for "Thermessa" an ancient Greek name for the island of Vulcano. |
| Synonym: |
IMA2007-030 |
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