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Lewisite Mineral Data
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General Lewisite Information
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 Chemical Formula: |
(Ca,Fe++,Na)2(Sb,Ti)2O7 |
| Composition: |
Molecular Weight = 426.94 gm |
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Sodium 0.81 % Na 1.09 % Na2O |
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Calcium 12.20 % Ca 17.08 % CaO |
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Titanium 2.24 % Ti 3.74 % TiO2 |
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Manganese 0.64 % Mn 0.83 % MnO |
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Iron 6.54 % Fe 8.41 % FeO |
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Antimony 51.33 % Sb 68.19 % Sb2O5 |
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Oxygen 26.23 % O |
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______ ______ |
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100.00 % 99.34 % = TOTAL OXIDE |
| Empirical Formula: |
Ca1.3Fe2+0.5Na0.15Mn2+0.05Sb1.8Ti0.2O7 |
| Environment: |
An alteration of large tetrahedrite crystals and in eluvial sands. Lewisite (1899) is now considered Ti-bearing romeite. |
| IMA Status: |
Discredited IMA 2006 (Dana # Added) |
| Locality: |
Tripuhy cinnabar mine, Ouro Preto, Minas Gerais, Barzil. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Willam James Lewis (1847-1926), Professor of Mineralogy, Cambridge University, Canbridge, England. |
| Name Pronunciation: |
Lewisite  |
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