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Adjective: microcrystalline  ,mI-krow'kris-tu-lun or ,mI-krow'kris-tu,lIn [N. Amer], ,mI-krow'kris-tu,lIn [Brit]
  1. Containing crystals that are visible only under a microscope
    "The microcrystalline structure of the rock was revealed under high magnification"

See also: crystalline

Encyclopedia: Microcrystalline