A material composed of crystals too small to be recognized even under polarizing microscope. Cryptocrystalline sedimentary rocks include chalcedony, chert, and flint. Igneous cryptocrystalline rocks include carbonado (a type of diamond) and some felsic rocks such as rhyolite.
Synonyms and Related Terms
Sources Checked for Data in Record
- Submitted information Comment: José Delgado Rodrigues, LNEC, 2009
- Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: Cryptocrystalline (accessed March 2010)