olivenite
noun
oliv·en·ite
ōˈlivəˌnīt,
ˈäləvəˌ-
plural -s
: a mineral Cu2(AsO4)(OH) consisting of a basic arsenate of copper that is olive green, dull brown, or yellowish in color
Word History
Etymology
German olivenit, from olive (from Latin oliva) + -it -ite