(Of a material) formed of microscopic crystals.
- The extent of change, however, varies considerably, depending on the type of microcrystalline stone and on the heat treatment procedures used.
- Associated minerals include pyrophyllite, lazulite, quartz, various brightly colored iron oxides, barite, and a suite of microcrystalline phosphates.
- This difference is due to the fact that most volcanic rocks are microcrystalline or partly glassy, and thus it is more difficult to classify them by their mineralogical composition.
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