Quiz: Remember the definition of mal de mer?
common green ore of copper, late 14c., from French, ultimately from Greek malachitis (lithos) "mallow (stone)," from malakhe "mallow" (see mallow (n.)); the mineral traditionally so called from resemblance of its color to that of the leaves of the mallow plant.
A bright-green monoclinic mineral occurring as a mass of crystals (an aggregate) with smooth or botryoidal (grape-shaped) surfaces. It is often concentrically banded in different shades of green. Malachite often occurs together with the mineral azurite in copper deposits. Chemical formula: Cu2CO3(OH)2.