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eucairite

noun
eu·​cai·​rite
variants: or less commonly eukairite \ yüˈkīˌrīt, -​kā-​ \
plural -s

Definition of eucairite 

: a mineral CuAgSe composed of a grayish metallic-looking copper silver selenide (specific gravity 7.50)

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History and Etymology for eucairite

Swedish eukairit, from Greek eukairos seasonable, opportune (from eu- + kairos time, season) + Swedish -it -ite; from its being found soon after the discovery of selenium

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