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Turtmannite Mineral Data
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General Turtmannite Information
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 Chemical Formula: |
(Mn,Mg)25.5[(V,As)O4]3(SiO4)3[AsO3]xO5-5x(OH)20+x |
| Composition: |
Molecular Weight = 2,396.92 gm |
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Magnesium 2.54 % Mg 4.20 % MgO |
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Manganese 52.72 % Mn 68.07 % MnO |
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Vanadium 4.78 % V 8.54 % V2O5 |
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Silicon 3.52 % Si 7.52 % SiO2 |
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Arsenic 3.28 % As 1.24 % As2O3 / 3.60 % As2O5
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Hydrogen 0.84 % H 7.53 % H2O |
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Oxygen 32.33 % O |
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______ ______ |
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100.00 % 100.69 % = TOTAL OXIDE |
| Empirical Formula: |
Mn2+23Mg2.5(VO4)2.25(AsO4)0.75(SiO4)3(AsO3)0.3O3.5(OH)20.03 |
| Environment: |
Manganoan paleokarst lenses in Triassic marbles metamorphosed to upper greenshist facies. Similar to mcgovernite; structure |
| IMA Status: |
Approved IMA 2000 (Dana # Added) |
| Locality: |
Barrhorn Unit (Central Alps) in the Triassic marbles near Turtmanntal, Valais, Switzerland. Link to MinDat.org Location Data. |
| Name Origin: |
Named after the locality. |
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