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Pennantite Mineral Data
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General Pennantite Information
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 Chemical Formula: |
Mn5Al(Si3Al)O10(OH)8 |
| Composition: |
Molecular Weight = 708.96 gm |
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Manganese 38.75 % Mn 50.03 % MnO |
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Aluminum 7.61 % Al 14.38 % Al2O3 |
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Silicon 11.88 % Si 25.42 % SiO2 |
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Hydrogen 1.14 % H 10.16 % H2O |
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Oxygen 40.62 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Mn2+5Al2Si3O10(OH)8 |
| Environment: |
Metamorhpic or hydrothermally altered manganese- and zinc-bearing assemblages. |
| IMA Status: |
Valid Species (Pre-IMA) 1946 |
| Locality: |
Ty Canol incline, Benault mine, Rhiw, Carnarvonshire, Lleyn Peninsula, Gwynedd, Wales. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Thomas Pennant (1726-1798), Welsh naturalist. |
| Name Pronunciation: |
Pennantite + Pronunciation  |
| Synonym: |
Grovesite |
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