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Simpsonite Mineral Data
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General Simpsonite Information
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 Chemical Formula: |
Al4(Ta,Nb)3O13(OH) |
| Composition: |
Molecular Weight = 813.65 gm |
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Tantalum 53.37 % Ta 65.17 % Ta2O5 |
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Niobium 5.71 % Nb 8.17 % Nb2O5 |
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Aluminum 13.26 % Al 25.06 % Al2O3 |
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Hydrogen 0.12 % H 1.11 % H2O |
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Oxygen 27.53 % O |
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______ ______ |
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100.00 % 99.51 % = TOTAL OXIDE |
| Empirical Formula: |
Al4Ta2.4Nb0.5O13(OH) |
| Environment: |
Accessory mineral in some tantalum-rich granite pegmatites. |
| IMA Status: |
Valid Species (Pre-IMA) 1938 |
| Locality: |
Tabba Tabba, Western Australia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Edward Sydney Simpson (1875-1939), Western Australian government mineralogis and mineral analyst. |
| Name Pronunciation: |
Simpsonite + Pronunciation  |
| Synonym: |
ICSD 67673 |
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PDF 15-705 |
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