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cooperite

[koo-puh-rahyt] /ˈku pəˌraɪt/
noun
1.
a mineral, sulfide and arsenide of platinum, occurring in igneous rocks in the form of steel-gray crystals.
Origin
after R. A. Cooper, who described it in 1920; see -ite1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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