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Robertsite Mineral Data
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General Robertsite Information
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 Chemical Formula: |
Ca6Mn+++9(PO4)9O6(H2O)6•3(H2O) |
| Composition: |
Molecular Weight = 1,739.69 gm |
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Calcium 13.82 % Ca 19.34 % CaO |
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Manganese 28.42 % Mn 36.70 % MnO |
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Phosphorus 16.02 % P 36.72 % P2O5 |
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Hydrogen 0.35 % H 3.11 % H2O |
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Oxygen 41.39 % O |
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______ ______ |
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100.00 % 95.86 % = TOTAL OXIDE |
| Empirical Formula: |
Ca6Mn2+9(PO4)9O6•3(H2O) |
| IMA Status: |
Approved IMA 1974 |
| Locality: |
Tip Top mine, Custer County, South Dakota, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Willard Lincoln Roberts (1923-1987), mineralogist, South Dakota School of Mines. |
| Name Pronunciation: |
Robertsite + Pronunciation  |
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