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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

criptocristalino (Port.)

Resources and Citations

  • José Delgado Rodrigues, LNEC, Submitted information, 2009
  • Wikipedia: Cryptocrystalline (accessed March 2010)

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