(geology) a small irregular concretion found on deep ocean floors having high concentrations of certain metals, esp manganese
noun 1. Mineralogy. rhodonite or rhodochrosite.
noun 1. any of various steels containing manganese, especially one that has up to 14 percent manganese, used in work involving heavy strains and impacts. noun 1. any very hard steel containing manganese (11–14 per cent), used in dredger buckets, rock-crushers, railway points, etc
noun, Chemistry. 1. . noun, Chemistry. 1. a pink, water-soluble, usually tetrahydrate salt, MnSO 4 ⋅4H 2 O, used chiefly in fertilizers, paints, and varnishes.
[man-gan-ik, mang-] /mænˈgæn ɪk, mæŋ-/ adjective, Chemistry. 1. of or containing , especially in the trivalent state. /mænˈɡænɪk/ adjective 1. of or containing manganese in the trivalent state