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From: Webster's Revised Unabridged Dictionary (1913)

 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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