GEOLOGY & PLANETARY SCIENCE A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site mica Mica. Credit: U.S. Geological Survey Any of a group of chemically and physically related complex mineral silicates, common in igneous and metamorphic rocks, occurring in thin, flaky sheets. The three main members of the group are muscovite, biotite, and lepidolite. Flakes of mica are used as electrical insulators and as the dielectric in capacitors. Related category    • GEOLOGY AND PLANETARY SCIENCE Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP