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 onyx A sample of brown onyx from Iran A variety of chalcedony with variegated bands, straight rather than curved as in agate. Sardonyx has white and brown bands; carnelian onyx white and red. Onyx is used as a gemstone, especially for cameos and intaglios. 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