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Offretite Mineral Data
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General Offretite Information
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 Chemical Formula: |
(K2,Ca,Mg)2.5Al5Si13O36•15(H2O) |
| Composition: |
Molecular Weight = 1,453.72 gm |
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Potassium 2.96 % K 3.56 % K2O |
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Calcium 3.03 % Ca 4.24 % CaO |
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Magnesium 1.17 % Mg 1.94 % MgO |
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Aluminum 9.65 % Al 18.24 % Al2O3 |
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Silicon 24.73 % Si 52.90 % SiO2 |
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Hydrogen 2.11 % H 18.84 % H2O |
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Oxygen 56.35 % O |
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______ ______ |
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100.00 % 99.72 % = TOTAL OXIDE |
| Empirical Formula: |
K1.1Ca1.1Mg0.7Al5.2Si12.8O36•15.2(H2O) |
| Environment: |
Alteration of basalt with the addition of potash. |
| IMA Status: |
Valid Species (Pre-IMA) 1890 |
| Locality: |
Mont Simiouse, near Montbrison, Loire, France. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Albert Jules Joseph Offret (1857-?), professor in the Faculty of Sciences, Lyon, France. |
| Name Pronunciation: |
Offretite + Pronunciation  |
| Synonym: |
ICSD 8292 |
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PDF 25-1186 |
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