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Crookesite
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==Characteristics== Its chemical formula is reported either as {{chem|[[Copper|Cu]]|7|([[Thallium|Tl]]|, [[Silver|Ag]])|[[Selenium|Se]]|4}} or {{chem|([[Copper|Cu]]|, [[Thallium|Tl]]|, [[Silver|Ag]])|2|[[Selenium|Se]]}}.<ref>http://www.mindat.org/min-1159.html Mindat</ref> It is formed by precipitation from [[hydrothermal]] fluids, and contains by mass: 16.3% Tl, 47.3% Cu, 2.9% Ag, and 33.6% Se.<ref name=Webmin/> Crookesite is an opaque, bluish grey to pink toned brown metallic mineral crystallizing in the [[tetragonal]] system. It has a [[Mohs hardness]] of 2.5 to 3 and a [[specific gravity]] of 6.9.
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