Composition: Copper silicate hydroxide
Nomenclature: Named after the Greek word "dioptezein" which means "to see into" because its cleavage planes could be seen by looking into the crystal.
Industrial Uses: Copper ore.
Additional Notes: .
Angola : Scott 553 : 1.5 escudo : 31 Oct 1970
Dioptase
Congo People's Republic : Scott C95 : 150 CFA francs : 20 Mar 1970
Dioptase
Namibia : Scott 679 : 20 cents : 2 Jan 1991
Dioptase
Zaire : Scott 1108 : 6 zaire : 13 Feb 1983
Dioptase