Composition: Silicon oxide
Nomenclature: Named after the Greek words "chrysos" and "prason" which means "gold" and "a leek" respectively because of its color.
Industrial Uses: Gemstone.
Additional Notes: Chrysoprase is a variety of chalcedony that is impregnated with nickel compounds to produce a bright yellow-green color. Chalcedony is a cryptocrystalline (crystals of sub-microscopic size) variety of quartz with a somewhat waxy appearance.
Australia : Scott 558 : 6 cents : 11 Jul 1973
Chrysoprase (quartz - chalcedony)