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  1. Said of the holocrystalline texture of an igneous or metamorphic rock, characterized by crystals bounded by their own rational faces. Also said of a rock with such a texture. The term idiomorphic is more common in U.S. usage. CF: xenomorphic
  2. A synonym of euhedral, obsolete in U.S. usage, but generally preferred in European usage. Syn: automorphic-granular; euhedral. AGI
    Source: Dictionary of Mining, Mineral, and Related Terms

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