crookesite

noun

crookes·​ite

ˈkru̇kˌsīt

plural -s

: a mineral (Cu,Tl,Ag)₂Se consisting of selenide of copper, thallium, and silver occurring in lead-gray metallic-looking masses (specific gravity 6.9)

Word History

Etymology

French, from Sir Wm. Crookes + French -ite

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