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Birnessite Mineral Data
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General Birnessite Information
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 Chemical Formula: |
(Na,Ca,K)x(Mn++++,Mn+++)2O4•1.5(H2O) |
| Composition: |
Molecular Weight = 215.71 gm |
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Potassium 1.81 % K 2.18 % K2O |
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Sodium 3.20 % Na 4.31 % Na2O |
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Calcium 1.86 % Ca 2.60 % CaO |
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Manganese 50.94 % Mn 36.59 % Mn2O3 / 40.30 % MnO2 |
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Hydrogen 1.40 % H 12.53 % H2O |
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Oxygen 40.79 % O |
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______ ______ |
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100.00 % 98.52 % = TOTAL OXIDE |
| Empirical Formula: |
Na0.3Ca0.1K0.1Mn4+Mn3+O4•1.5(H2O) |
| Environment: |
Found as grains cementing gravel in a road cut 30 km N of Aberdeen. Major component of desert varnish. Deep sea Mn nodules. |
| IMA Status: |
Valid Species (Pre-IMA) 1956 |
| Locality: |
Birness, Aberdeenshire, Scotland. Link to MinDat.org Location Data. |
| Name Origin: |
Named after the locality. |
| Name Pronunciation: |
Birnessite + Pronunciation  |
| Synonym: |
ICSD 68916 |
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PDF 23-1046 |
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