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Olmsteadite Mineral Data
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General Olmsteadite Information
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 Chemical Formula: |
KFe++2(Nb,Ta)(PO4)2O2•2(H2O) |
| Composition: |
Molecular Weight = 523.68 gm |
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Potassium 7.47 % K 8.99 % K2O |
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Tantalum 8.64 % Ta 10.55 % Ta2O5 |
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Niobium 13.31 % Nb 19.03 % Nb2O5 |
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Iron 21.33 % Fe 27.44 % FeO |
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Phosphorus 11.83 % P 27.11 % P2O5 |
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Hydrogen 0.77 % H 6.88 % H2O |
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Oxygen 36.66 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
KFe2+2Nb0.75Ta0.25(PO4)2O2•2(H2O) |
| Environment: |
Found in Nb-Ta bearing pegmatites. |
| IMA Status: |
Approved IMA 1976 |
| Locality: |
Big Chief pegmatite, near Glendale, Pennington County, South Dakota, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Milo Olmstead, micromount mineral collector, Rapid City, South Dakota, USA. |
| Name Pronunciation: |
Olmsteadite + Pronunciation  |
| Synonym: |
ICSD 12138 |
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PDF 35-633 |
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