noun
also eu·kai·rite yüˈkīˌrīt, -kā-
( -s )
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
: a mineral CuAgSe composed of a grayish metallic-looking copper silver selenide (sp. gr. 7.50)