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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Psi·lom·e·lane n.  Min. A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron-black or steel-gray color.
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From: WordNet (r) 2.0

 psilomelane
      n : a mineral consisting of hydrated basic oxide of manganese
          and barium; a source of manganese