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Cryptomelane Mineral Data
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General Cryptomelane Information
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 Chemical Formula: |
K(Mn++++,Mn++)8O16 |
| Composition: |
Molecular Weight = 734.59 gm |
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Potassium 5.32 % K 6.41 % K2O |
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Manganese 59.83 % Mn 19.31 % MnO / 71.01 % MnO2 |
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Oxygen 34.85 % O |
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______ ______ |
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100.00 % 96.73 % = TOTAL OXIDE |
| Empirical Formula: |
KMn4+6Mn2+2O16 |
| Environment: |
Commonest of the hard, black, fine-grained manganese oxides formerly called psilomelane. |
| IMA Status: |
Valid Species (Pre-IMA) 1942 |
| Locality: |
Chindwara, India. Link to MinDat.org Location Data. |
| Name Origin: |
From the Greek for hidden and black, as the identity of this common, black mineral is lost in the group of other black Mn-bearing oxides. |
| Name Pronunciation: |
Cryptomelane + Pronunciation  |
| Synonym: |
Psilomelane |
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