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Steacyite Mineral Data
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General Steacyite Information
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 Chemical Formula: |
K1-x(Ca,Na)2ThSi8O20 (x=0.2 to 0.4) |
| Composition: |
Molecular Weight = 825.70 gm |
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Potassium 2.84 % K 3.42 % K2O |
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Sodium 1.95 % Na 2.63 % Na2O |
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Calcium 3.40 % Ca 4.75 % CaO |
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Thorium 25.29 % Th 28.78 % ThO2 |
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Manganese 1.33 % Mn 1.72 % MnO |
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Silicon 27.21 % Si 58.21 % SiO2 |
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Oxygen 37.98 % O |
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______ ______ |
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100.00 % 99.52 % = TOTAL OXIDE |
| Empirical Formula: |
K0.6Na0.7Ca0.7Mn2+0.2Th0.9Si8O19.6 |
| Environment: |
In cavities in pegmatite veins in nepheline syenite. |
| IMA Status: |
Approved IMA 1982 |
| Locality: |
Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Harold R. Steacy, formerly Curator of the National Mineral Collection, Geological Survey of Canada, Ottawa, Canada. |
| Name Pronunciation: |
Steacyite + Pronunciation  |
| Synonym: |
Desourdyite |
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