Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A steel-gray to black mineral, MnO(OH), found in North America and Europe; manganese oxide.

from The Century Dictionary.

  • noun A hydrated oxid of manganese occurring in orthorhombic crystals of a steel-gray or iron-black color and brilliant luster, also in masses having a columnar structure. It is often altered, by loss of water, to pyrolusite. Also called gray manganese ore.
  • noun A substance which may be viewed as a compound of manganese dioxid with the monoxid of a more basic or electropositive metal.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Min.) One of the oxides of manganese; -- called also gray manganese ore. It occurs in brilliant steel-gray or iron-black crystals, also massive.
  • noun (Chem.) A compound of manganese dioxide with a metallic oxide; so called as though derived from the hypothetical manganous acid.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology a dark gray mineral of manganese, MnO(OH), found throughout North America and Europe

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a black mineral consisting of basic manganese oxide; a source of manganese

Etymologies

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