Mineralogy Database

Cookeite Mineral Data

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General Cookeite Information

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