Get the FREE one-click dictionary software for Windows
or the iPhone/iPad and Android apps
Adjective: cryptocrystalline  ,krip-tow'kris-tu-lin or ,krip-tow'kris-tu,lIn
  1. (geology) Having a crystalline structure too fine to be seen even under a microscope
    "cryptocrystalline quartz in agate"

Encyclopedia: Cryptocrystalline