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A steel-gray to black mineral, MnO(OH), found in North America and Europe; manganese oxide.


(Minerals) a blackish mineral consisting of basic manganese oxide in monoclinic crystalline form: a source of manganese. Formula: MnO(OH)


(ˈmæŋ gəˌnaɪt)

1. a gray to black mineral, hydrous manganese oxide, MnO(OH); gray manganese ore.
2. any of a series of salts containing tetravalent manganese and derived from either of two acids, H4MnO4 or H2MnO3.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.manganite - a black mineral consisting of basic manganese oxidemanganite - a black mineral consisting of basic manganese oxide; a source of manganese
atomic number 25, manganese, Mn - a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
References in periodicals archive ?
Widenmann (1794) described strahliger ("radiating") braunstein from "Ilefeld am Hartze." Jameson (1805), in his summary of localities for the "radiating gray manganese ore" and the "foliated gray manganese ore" of Werner, lists "Ilefeld in the Hartz." Breithaupt (1823), in summarizing the manganese oxides, listed among the Ilfeld minerals what he called Weichmanganerz ("soft manganese ore"), meaning the "usual so-called gray braunstein or gray manganerz"; Schwarzmanganerz ("black manganese ore" or Werner's "black braunstein") and Glanzmanganerz ("lustrous manganese ore").
The calcite pseudomorphs are dull to sub-metallic gray replacements of rough-surfaced scalenohedral calcite crystals to 10 cm, alone and in groups on massive gray manganese ore, in some cases with overgrowths of a later generation of calcite (Jasche, 1838; Sillem, 1852).