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Sillimanite Mineral Data
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General Sillimanite Information
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 Chemical Formula: |
Al2SiO5 = Al[6]Al[4]OSiO4 |
| Composition: |
Molecular Weight = 162.05 gm |
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Aluminum 33.30 % Al 62.92 % Al2O3 |
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Silicon 17.33 % Si 37.08 % SiO2 |
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Oxygen 49.37 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
(Al2O3)(SiO2) |
| Environment: |
Metamorphosed peri-aluminous sedimentary rocks. |
| IMA Status: |
Valid Species (Pre-IMA) 1824 |
| Locality: |
Wide spread world wide occurrences. Link to MinDat.org Location Data. |
| Name Origin: |
Named after the American chemist and mineralogist, B. Silliman (1779-1824). |
| Name Pronunciation: |
Sillimanite + Pronunciation  |
| Synonym: |
Fibrolite |
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ICSD 100450 |
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PDF 38-471 |
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