Cryptocrystalline rocks have a texture made up of crystals so small that even when viewed under a microscope in thin sections, transmitted polarised light can only hazard a guess as to their crystalline composition.
A dull stony-looking rock results, the vitreous lustre having entirely disappeared, and in microscopic section this exhibits a cryptocrystalline structure, being made up of exceedingly minute grains principally of quartz and felspar.
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