Definition: malachite

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Source: WordNet (r) 1.7 

malachite
     n : a green mineral used as an ore of copper and for making
         ornamental objects

Source: Webster's Revised Unabridged Dictionary (1913) 

Malachite \Mal"a*chite\, n. [Fr. Gr. ? a mallow, from its
   resembling the green color of the leaf of mallows: cf. F.
   malachite. Cf. Mallow.] (Min.)
   Native hydrous carbonate of copper, usually occurring in
   green mammillary masses with concentric fibrous structure.

   Note: Green malachite, or malachite proper, admits of a high
         polish, and is sometimes used for ornamental work. Blue
         malachite, or azurite, is a related species of a deep
         blue color.

   Malachite green. See Emerald green, under Green, n.