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Franciscanite-III Mineral Data
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General Franciscanite-III Information
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 Chemical Formula: |
Mn++6V+++++2Si2(O,OH)14 |
| Composition: |
Molecular Weight = 713.69 gm |
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Manganese 46.19 % Mn 59.64 % MnO |
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Vanadium 14.28 % V 25.48 % V2O5 |
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Silicon 7.87 % Si 16.84 % SiO2 |
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Hydrogen 0.28 % H 2.52 % H2O |
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Oxygen 31.39 % O |
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______ ______ |
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100.00 % 104.48 % = TOTAL OXIDE |
| Empirical Formula: |
Mn2+6V5+2Si2O12(OH)2 |
| 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 age Franciscan Formation. |
| Name Pronunciation: |
Franciscanite-III + Pronunciation  |
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