1. Noun
One of the oxides of manganese; -- called also gray manganese ore. It occurs in brilliant steel-gray or iron-black crystals, also massive.
2. Noun
A compound of manganese dioxide with a metallic oxide; so called as though derived from the hypothetical manganous acid.
3. Noun
a black mineral consisting of basic manganese oxide; a source of manganese
Vocabulary classified under Chemistry
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