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Cerchiaraite Mineral Data
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General Cerchiaraite Information
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 Chemical Formula: |
Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26 |
| Composition: |
Molecular Weight = 1,398.66 gm |
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Barium 39.27 % Ba 43.85 % BaO |
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Manganese 13.35 % Mn 17.24 % MnO |
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Aluminum 0.58 % Al 1.09 % Al2O3 |
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Iron 1.60 % Fe 2.05 % FeO |
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Silicon 12.05 % Si 25.77 % SiO2 |
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Hydrogen 0.52 % H 4.64 % H2O |
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Chlorine 3.80 % Cl 3.80 % Cl |
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- %
Cl -0.86 % -O=Cl2 |
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Oxygen 28.83 % O |
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______ ______ |
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100.00 % 97.60 % = TOTAL OXIDE |
| Empirical Formula: |
Ba4Mn2+3.4Fe2+0.4Al0.3Si6O18(OH)7.2Cl1.5 |
| Environment: |
Individual grains in fractures. |
| IMA Status: |
Approved IMA 1999 (Dana # Added) |
| Locality: |
Cerchiara manganese (braunite) mine, Val di Vara, eastern Liguria, Italy. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Synonym: |
IMA1999-012 |
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