Aphanitic

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  1. Said of the texture of an igneous rock in which the crystalline components are not distinguishable by the unaided eye; also said of a rock or a groundmass exhibiting such texture. CF: aphanite; phaneritic. Syn: fine-grained
  2. A crystalline texture with individual crystals too small to be visible to the unaided eye. Syn: cryptocrystalline
    Source: Dictionary of Mining, Mineral, and Related Terms


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