(of rocks) composed of crystals that can be distinguished individually only by the use of a polarizing microscope
WordReference Random House Unabridged Dictionary of American English © 2025
cryp•to•crys•tal•line
(krip′tō kris′tl in, -īn′),USA pronunciation adj. [Mineral.]
- Mineralogyhaving a microscopic crystalline structure.
- crypto- + crystalline 1860–65
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'cryptocrystalline' also found in these entries (note: many are not synonyms or translations):