crookesiten.
/ˈkrʊksʌɪt/ Mineralogy.
A brittle, lead-grey selenide of copper, thallium, and silver.
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crookesite1868
1868 J. D. Dana Syst. Mineral. (ed. 5) ii. 40 Crookesite... Massive, compact; no trace of crystallization.
1877 E. S. Dana Text-bk. Mineral. 213 Crookesite... Formerly regarded as selenide of copper or berzelianite.
1946 J. R. Partington Gen. & Inorg. Chem. xvi. 431 The only minerals rich in thallium are crookesite (17 p.c. Tl, with Se, Cu, Ag) and lorandite.
This entry has not yet been fully updated (first published 1933; most recently modified version published online March 2022).
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n.1868