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Arnhemite Mineral Data
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General Arnhemite Information
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 Chemical Formula: |
(K,Na)2Mg2(P2O7)•5(H2O) |
| Composition: |
Molecular Weight = 620.94 gm |
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Potassium 17.50 % K 21.09 % K2O |
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Sodium 3.37 % Na 4.54 % Na2O |
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Calcium 0.97 % Ca 1.35 % CaO |
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Magnesium 6.89 % Mg 11.42 % MgO |
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Manganese 0.18 % Mn 0.23 % MnO |
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Zinc 0.11 % Zn 0.13 % ZnO |
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Iron 0.27 % Fe 0.35 % FeO |
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Phosphorus 20.10 % P 46.06 % P2O5 |
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Hydrogen 1.66 % H 14.83 % H2O |
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Oxygen 48.96 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
K2.78Na0.91Mg1.76Ca0.15Fe2+0.03Mn2+0.02Zn0.01P4.03O13.89�5.11(H2O) |
| Environment: |
Occurs as flakes that form aggregates making up the principal component of a thin layer of white, friable slag in the profile of cave-floor soil. |
| IMA Status: |
Not Approved IMA |
| Locality: |
Arnhem Cave, Namibia. Link to MinDat.org Location Data. |
| Name Origin: |
Named after it's locality. |
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