man·ga·nite /ˈmæŋgəˌnaɪt/
水錳礦
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.
2. Chem. A compound of manganese dioxide with a metallic oxide; so called as though derived from the hypothetical manganous acid.
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manganite
n : a black mineral consisting of basic manganese oxide; a
source of manganese