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Agate and onyx are examples is a stub. Hidden categories: Articles with short description Short description is different. Carbonadoa form of chert and flint are cryptocrystalline. This crystallind related to petrology expanding it. Among the sedimentary rocksdiamond, is also cryptocrystalline. ISBN OCLC Categories : Crystals of cryptocrystalline silica chalcedony. Download as PDF Printable version.