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Cookeite Mineral Data
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General Cookeite Information
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 Chemical Formula: |
LiAl4(Si3Al)O10(OH)8 |
| Composition: |
Molecular Weight = 522.16 gm |
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Lithium 1.33 % Li 2.86 % Li2O |
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Aluminum 25.84 % Al 48.82 % Al2O3 |
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Silicon 16.14 % Si 34.52 % SiO2 |
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Hydrogen 1.54 % H 13.80 % H2O |
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Oxygen 55.15 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
LiAl5Si3O10(OH)8 |
| Environment: |
Alteration of lithia tourmalines and lepidolite in pegmatites. |
| IMA Status: |
Valid Species (Pre-IMA) 1866 |
| Locality: |
Oxford Co., Maine, USA. Pala, San Diego Co., California, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Josiah B. Cooke, Jr. (1827-1894), American mineralogist and chemist, Harvard University, Cambridge, Massachusetts, USA. |
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