Found 1 items, similar to gray manganese ore.
English → English (gcide) Definition: gray manganese ore Manganite \Man"ga*nite\, n. 1. (Min.) One of the oxides of manganese; -- called also gray manganese ore. It occurs in brilliant steel-gray or iron-black crystals, also massive. [1913 Webster] 2. (Chem.) A compound of manganese dioxide with a metallic oxide; so called as though derived from the hypothetical manganous acid. [1913 Webster]