eucairite
noun
eu·cai·rite
variants or less commonly eukairite
yüˈkīˌrīt,
-kā-
plural -s
: a mineral CuAgSe composed of a grayish metallic-looking copper silver selenide (specific gravity 7.50)
Word History
Etymology
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