Manganite
Pronunciation : Man"ga*nite
Part of Speech : n.
Definition : 1. (Min.)
Defn: 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.)
Defn: A compound of manganese dioxide with a metallic oxide; so called as though derived from the hypothetical manganous acid.
Source : Webster's Unabridged Dictionary, 1913