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Tvedalite Mineral Data
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General Tvedalite Information
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 Chemical Formula: |
(Ca,Mn++)4Be3Si6O17(OH)4•3(H2O) |
| Composition: |
Molecular Weight = 764.79 gm |
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Calcium 15.72 % Ca 22.00 % CaO |
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Manganese 7.18 % Mn 9.28 % MnO |
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Beryllium 3.54 % Be 9.81 % BeO |
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Silicon 22.03 % Si 47.14 % SiO2 |
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Hydrogen 1.32 % H 11.78 % H2O |
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Oxygen 50.21 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Ca3Mn2+Be3Si6O17(OH)4•3(H2O) |
| Environment: |
In vugs in a nepheline-syenite pegmatite. Always overgrown by a crust of chiavennite. |
| IMA Status: |
Approved IMA 1992 |
| Locality: |
Vevja larvikite quarry, Tvedalen, Brunlanes, Vestfold Co., Norway. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the type locality. |
| Name Pronunciation: |
Tvedalite + Pronunciation  |
| Synonym: |
IMA1990-027 |
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