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.
The very last fluorite to crystallize left a dusting of microcrystalline snow-white material occupying most of the tight junctures where quartz crystals come together.
Associated minerals include pyrophyllite, lazulite, quartz, various brightly colored iron oxides, barite, and a suite of microcrystalline phosphates.
Finally, the whole surface is protected with a microcrystalline wax containing a corrosion inhibitor.
The extent of change, however, varies considerably, depending on the type of microcrystalline stone and on the heat treatment procedures used.
Definition of microcrystalline in US English:
microcrystalline
adjective
(of a material) formed of microscopic crystals.
（物质）微晶的
Example sentencesExamples
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.
The very last fluorite to crystallize left a dusting of microcrystalline snow-white material occupying most of the tight junctures where quartz crystals come together.
The extent of change, however, varies considerably, depending on the type of microcrystalline stone and on the heat treatment procedures used.
Finally, the whole surface is protected with a microcrystalline wax containing a corrosion inhibitor.
Associated minerals include pyrophyllite, lazulite, quartz, various brightly colored iron oxides, barite, and a suite of microcrystalline phosphates.