} fair on {010} | fracture = Subconchoidal to uneven | mohs = 3.5–4.0 | luster = Adamantine to vitreous; silky if fibrous; dull to earthy if massive | refractive = nα = 1.655 nβ = 1.875 nγ = 1.909 | opticalprop = Biaxial (–) | birefringence = δ = 0.254 | pleochroism = | streak = light green | gravity = 3.6–4 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Translucent to opaque | other = | references = }} Malachite is a copper carbonate hydroxide mineral, with the formula Cu2CO3(OH)2.
