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Manganipiemontite-(Sr) Mineral Data
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General Manganipiemontite-(Sr) Information
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 Chemical Formula: |
CaSr(Mn+++,Fe+++)2Al[Si3O12](OH) |
| Composition: |
Molecular Weight = 559.08 gm |
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Strontium 15.67 % Sr 18.53 % SrO |
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Calcium 7.17 % Ca 10.03 % CaO |
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Manganese 14.74 % Mn 21.18 % Mn2O3 |
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Aluminum 6.27 % Al 11.85 % Al2O3 |
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Iron 4.00 % Fe 5.71 % Fe2O3 |
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Silicon 15.07 % Si 32.24 % SiO2 |
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Hydrogen 0.16 % H 1.45 % H2O |
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Oxygen 36.92 % O |
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______ ______ |
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100.00 % 101.00 % = TOTAL OXIDE |
| Empirical Formula: |
CaSrMn3+1.5Al0.3Fe3+0.4Al(Si3O12)(OH)0.9 |
| Environment: |
Calc-silicate rocks formed by hydrothermal alteration of Mn ores. Epidote Group. |
| IMA Status: |
Approved IMA 2002 (Dana # Added) |
| Locality: |
Wessels mine, Kalahari manganese fields, South Africa. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Samuel M. Tweddill, first curator (1897 to 1915) of the Museum of the Geological Survey, Pretoria, Republic of South Africa. |
| Synonym: |
IMA2001-014 |
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Tweddillite - Renamed to Manganipiemontite-(Sr) - Recommended nomenclature of epidote-group minerals, Eur. J. Mineral. 2006, 18, 551-567. |
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