olivenite
/əʊˈlɪvənʌɪt/ /ˈɒlɪvənʌɪt/Mineralogy
noun
Native basic copper arsenate, occurring as orthorhombic crystals or masses, usually of an olive-green colour.
Origin
Early 19th century; earliest use found in Robert Jameson (1774–1854), geologist and natural historian. From German Oliven- (in Olivenerz from Oliven-, combining form of Olive + Erz ore) + -ite.