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Pumpellyite-(Mn++) Mineral Data
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General Pumpellyite-(Mn++) Information
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 Chemical Formula: |
Ca2(Mn++,Mg)(Al,Mn+++,Fe)2(SiO4)(Si2O7(OH)2•(H2O) |
| Composition: |
Molecular Weight = 504.86 gm |
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Calcium 15.88 % Ca 22.22 % CaO |
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Magnesium 1.20 % Mg 2.00 % MgO |
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Manganese 16.32 % Mn 10.54 % MnO / 11.73 % Mn2O3 |
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Aluminum 5.34 % Al 10.10 % Al2O3 |
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Iron 2.77 % Fe 3.95 % Fe2O3 |
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Silicon 16.69 % Si 35.70 % SiO2 |
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Hydrogen 0.60 % H 5.35 % H2O |
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Oxygen 41.20 % O |
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______ ______ |
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100.00 % 101.58 % = TOTAL OXIDE |
| Empirical Formula: |
Ca2Mn2+0.75Mg0.25AlMn3+0.75Fe3+0.25(SiO4)(Si2O7)(OH)�(H2O) |
| Environment: |
Metamorphosed Mn-oxides in pelitic and dolomitic rocks. |
| IMA Status: |
Approved IMA 1981 |
| Locality: |
Ochiai mine, Barazawa, Kohsai-cho, Yamanashi Prefecture, Japan. Link to MinDat.org Location Data. |
| Name Origin: |
Named after the American geologist, R. Pumpelly (1837-1923). |
| Name Pronunciation: |
Pumpellyite-(Mn++) + Pronunciation  |
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