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Povondraite Mineral Data
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General Povondraite Information
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 Chemical Formula: |
(Na,K)(Fe+++,Fe++)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 |
| Composition: |
Molecular Weight = 1,156.50 gm |
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Potassium 0.85 % K 1.02 % K2O |
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Sodium 1.49 % Na 2.01 % Na2O |
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Magnesium 3.78 % Mg 6.27 % MgO |
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Aluminum 1.40 % Al 2.64 % Al2O3 |
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Iron 31.87 % Fe 27.02 % FeO / 15.53 % Fe2O3 |
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Silicon 14.57 % Si 31.17 % SiO2 |
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Boron 2.80 % B 9.03 % B2O3 |
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Hydrogen 0.35 % H 3.12 % H2O |
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Oxygen 42.89 % O |
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______ ______ |
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100.00 % 97.82 % = TOTAL OXIDE |
| Empirical Formula: |
Na0.75K0.25Fe3+2.25Fe2+0.75Fe2+3.6Mg1.8Al0.6(BO3)3(Si6O18)(OH)4 |
| Environment: |
Found in hydrothermally altered basalt clasts in a metamorphosed evaporite deposit. |
| IMA Status: |
Approved IMA 1993 (Dana # Changed) |
| Locality: |
Cristalmuya gorge, near San Francisco asbestos mine, Chapare Province, Cochabamba Department, Bolivia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Pavel Povandra (1924-), mineralogits, Charles University, Prague, Czech Repubic. |
| Name Pronunciation: |
Povondraite + Pronunciation  |
| Synonym: |
Ferridravite |
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ICSD 72941 |
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IMA1978-075 |
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PDF 33-1261 |
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Povondraite - (61.3.1.6) |
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Tourmaline |
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