KGS Navigation Bar, Search, Contact, KGS Home, UK Home University of Kentucky at Kentucky Geological Survey at Search KGS at contact kgs at KGS Home at UK Home at KGS Home

KGS Home > Industrial Minerals

Cryptocrystalline: A rock texture consisting of crystals that are too small to be recognized and separately distinguished even under the ordinary microscope. (Definition from Jackson, J.A., ed., 1997, Glossary of geology [4th ed.]: Alexandria, Va., American Geological Institute, 769 p.)