1.NounA bright green mineral, a basic copper carbonate, Cu2CO3(OH)2; one of the principal ores of copper.
2.NounA mild green color, like that of the mineral.
"malachite: "
3.AdjectiveOf a color ranging from olive-taupe to a mild to deeply-rich (at times seemingly translucent) green, like that of the mineral which is present on oxidized copper.