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crookesite

[kroo k-sahyt]
noun
  1. a rare mineral, selenide of copper, thallium, and silver, (Cu, Tl, Ag)2Se, occurring in steel-gray, compact masses.
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Origin of crookesite

1865–70; after Sir W. Crookes; see -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018