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Varennesite Mineral Data
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General Varennesite Information
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 Chemical Formula: |
Na8Mn++2Si10O25(OH,Cl)2•12(H2O) |
| Composition: |
Molecular Weight = 1,234.05 gm |
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Sodium 14.90 % Na 20.09 % Na2O |
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Manganese 8.90 % Mn 11.50 % MnO |
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Silicon 22.76 % Si 48.69 % SiO2 |
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Hydrogen 2.08 % H 18.61 % H2O |
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Chlorine 1.44 % Cl 1.44 % Cl |
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- %
Cl -0.32 % -O=Cl2 |
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Oxygen 49.91 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Na8Mn2+2Si10O25(OH)1.5Cl0.5•12(H2O) |
| Environment: |
As a primary, late-stage mineral in a sill. |
| IMA Status: |
Approved IMA 1995 |
| Locality: |
Demix-Varennes quarry, which lies between the villages of Varennes and Saint-Amable, in Vercheres County, Quebec Link to MinDat.org Location Data. |
| Name Origin: |
For the locality. |
| Name Pronunciation: |
Varennesite + Pronunciation  |
| Synonym: |
ICSD 81583 |
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IMA1994-017 |
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PDF 49-1860 |
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