Associated minerals are descloizite, duftite, mimetite, wulfenite, cerussite, azurite and dioptase. It occurs in association with atacamite, chrysocolla, connellite, cuprite, dioptase, goethite, malachite, plancheite, and tenorite. Dioptase and chrysocolla are the only relatively common copper silicate minerals. The eyes are created using cowrie shells with a bitumen pupil and dioptase highlighting. Here tiny bluish-green dioptase is found on and in quartz. Associated minerals include dioptase, fornacite, wulfenite, mimetite, cerussite and diaboleite. Tsumeb dioptase is transparent and often highly sought after by collectors. The most famous (and expensive) dioptase mineral locality is at Tsumeb, Namibia. Dioptase is also found in the deserts of the southwestern US. As a ground pigment, dioptase can be used in painting. Additionally, dioptase is very fragile and specimens must be handled with great care. Dioptase is an intense emerald-green to bluish-green copper cyclosilicate mineral. Dioptase is popular with mineral collectors and it is occasionally cut into small emerald-like gems.