Mineralogy Database

Crookesite Mineral Data

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General Crookesite Information

Help on Chemical  Formula: Chemical Formula: Cu7(Tl,Ag)Se4
Help on Composition: Composition: Molecular Weight = 940.92 gm
   Thallium  16.29 %  Tl
   Copper    47.28 %  Cu
   Silver     2.87 %  Ag
   Selenium  33.57 %  Se
            100.00 % 
Help on Empirical Formula: Empirical Formula: Cu7Tl0.75Ag0.25Se4
Help on Environment: Environment: Of hydrothermal origin, with other selenides.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1866
Help on Locality: Locality: From Skrikerum, near Tryserum, Kalmar, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: After Sir William Crookes (1832-1919), who discovered thallium.
Help on Synonym: Synonym: ICSD 69104
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