单词	microcrystalline
释义	microcrystalline /mʌɪkrə(ʊ)ˈkrɪstəlʌɪn / adjective (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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