Chrysocolla in Quartz Slabs from Arizona

Chrysocolla is a secondary copper mineral with a blue-green color, that some people mistake for turquoise. The main difference is turquoise contains phosphorus and chrysocolla does not.

Chrysocolla in Quartz (Gem Silica) takes a good polish with tin oxide or diamond, followed with green rouge (Zam is a brand name for green rouge). Mohs hardness 5.0 to 6.0.