dioptase
Instance URI: http://resource.geosciml.org/classifier/cgi/commodity-code/dioptase
Within scheme: South Australian Commodity Codes
Dioptase is a very beautiful mineral and it is one of the few minerals that can challenge the peerlessness of emerald's deep green. Unfortunately it is rather soft (for a gemstone) and has good cleavage and therefore is not usually cut as a gemstone.