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Sewardite Mineral Data
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General Sewardite Information
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 Chemical Formula: |
CaFe+++2(AsO4)2(OH)2 |
| Composition: |
Molecular Weight = 464.68 gm |
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Calcium 8.62 % Ca 12.07 % CaO |
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Zinc 1.41 % Zn 1.75 % ZnO |
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Iron 22.83 % Fe 32.65 % Fe2O3 |
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Arsenic 32.25 % As 49.46 % As2O5 |
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Hydrogen 0.46 % H 4.07 % H2O |
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Oxygen 34.43 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
CaFe3+1.9Zn0.1(AsO4)2(OH)1.9(H2O)0.1 |
| Environment: |
Intergrown with ferrilotharmeyerite and another unknown. (Ca-dominant analogue of carminite; structure) |
| IMA Status: |
Approved IMA 2002 (Dana # Added) |
| Locality: |
31st Level, Tsumeb mine, Tsumeb, Namibia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Terry Maxwell Seward (1940-) who collected the mineral. |
| Synonym: |
IMA2001-054 |
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