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  1. A monoclinic mineral, 2[Cu3 (OH)2 (CO3 )2 ]; forms vitreous azure crystals; a supergene mineral in oxidized parts of copper deposits associated with malachite; an ore of copper. Syn: azure spar; chessylite; blue copper; blue copper ore; blue malachite.
  2. A compact semiprecious stone derived from compact azurite and used as a decorator material.
  3. A trade name for a sky-blue gem variety of smithsonite.
    Source: Dictionary of Mining, Mineral, and Related Terms

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