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Bannisterite Mineral Data
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General Bannisterite Information
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 Chemical Formula: |
KCa(Mn,Fe++,Zn,Mg)21(Si,Al)32O76(OH)16•4-12(H2O) |
| Composition: |
Molecular Weight = 3,734.70 gm |
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Potassium 0.84 % K 1.01 % K2O |
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Sodium 0.12 % Na 0.17 % Na2O |
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Calcium 0.97 % Ca 1.35 % CaO |
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Magnesium 1.89 % Mg 3.13 % MgO |
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Manganese 17.95 % Mn 23.17 % MnO |
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Aluminum 2.17 % Al 4.10 % Al2O3 |
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Zinc 3.68 % Zn 4.58 % ZnO |
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Iron 5.23 % Fe 5.58 % FeO / 1.28 % Fe2O3 |
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Silicon 21.43 % Si 45.85 % SiO2 |
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Hydrogen 1.09 % H 9.74 % H2O |
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Oxygen 44.64 % O |
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______ ______ |
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100.00 % 99.96 % = TOTAL OXIDE |
| Empirical Formula: |
K0.8Na0.2Ca0.9Mn2+12.2Fe2+2.9Mg2.9Zn2.1Fe3+0.6Si28.5Al3O76(OH)16�12.2(H2O) |
| Environment: |
Metamorphosed Mn-Zn orebodies. |
| IMA Status: |
Valid Species (Pre-IMA) 1936 |
| Locality: |
In the Banallt mine, Rhiw, Lleyn Peninsula, Wales. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Dr. Frederick Allen Bannister (1901-?), formerly Keeper of Minerals, British Museum (Natural History), London, England. |
| Name Pronunciation: |
Bannisterite + Pronunciation  |
| Synonym: |
ICSD 80078 |
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PDF 46-1281 |
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