a mineral, manganese carbonate, MnCO3, commonly containing some iron and calcium, and usually rose-red in color: a minor ore of manganese; manganese spar.
rho·do·chro·site (rō'də-krō'sīt') n. A mineral consisting mainly of manganese carbonate, MnCO3, light pink to rose-red in color with a pearly or vitreous luster, used as a manganese ore.