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 carnelian Roman intaglio, in carnelian, of the Emperor Gallienus, c.260 AD Also called cornelian, a translucent variety of chalcedony, colored red by colloidal hematite. Carnelian is a semiprecious gemstone used in classical times for intaglio signets. 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