Did you mean malachite?
malachite
noun
°A bright green mineral, a basic copper carbonate, Cu2CO3(OH)2; one of the principal ores of copper.
°A mild green colour, like that of the mineral.
adjective
°From olive-taupe to that of a mild to deeply-rich -- at times seemingly translucent -- green colour, like that of the mineral which is present on oxidized copper.