Hypertext Webster Gateway: "manganite"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
2. (Chem.) A compound of manganese dioxide with a metallic
oxide; so called as though derived from the hypothetical
manganous acid.
From WordNet (r) 1.7 (wn)
manganite
n : a black mineral consisting of basic manganese oxide; a
source of manganese
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