mallow (n.)

common green ore of copper, a basic carbonate of copper having a beautiful green color, late 14c., from French malachite, ultimately from Greek malachitis (lithos) "mallow (stone)," from malakhe "mallow" (see mallow (n.)); the mineral traditionally so called from the resemblance of its color to that of the leaves of the mallow plant.

"of or pertaining to the mallow," 1690s, from Late Latin malvaceus, from Latin malva (see mallow).