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Franciscanite-VIII Mineral Data
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General Franciscanite-VIII Information
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 Chemical Formula: |
Mn++3(V+++++,[ ])1-x(SiO4)(O,OH)3(x=0.5) |
| Composition: |
Molecular Weight = 331.88 gm |
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Manganese 49.66 % Mn 64.12 % MnO |
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Vanadium 7.67 % V 13.70 % V2O5 |
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Silicon 8.46 % Si 18.10 % SiO2 |
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Hydrogen 0.46 % H 4.07 % H2O |
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Oxygen 33.75 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Mn2+3V5+0.5(SiO4)O1.5(OH)1.5 |
| Environment: |
Irregular segregations within a sheared sonolite-bearing assemblage in chert. |
| IMA Status: |
Approved IMA 1986 |
| Locality: |
Pennsylvania mine, SW side of San Antonio Valley, 4 miles ENE of Mount Halilton, Santa Clara Co. California. Link to MinDat.org Location Data. |
| Name Origin: |
Named after the Miocene-aged Franciscan Formation in California, USA.. |
| Name Pronunciation: |
Franciscanite-VIII + Pronunciation  |
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