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Chrysocolla
Chrysocolla is a copper silicate mineral. In it's purest form, it's not useable as jewelry as it is too soft, however, the higher the silica content, the harder the material. Chrysocolla has uniques shades of blue, but often contains malachite (green), cuprite (red) and Tenorite (black). When the ratio of silica is much higher than chrysocolla, and you basically have chalcedony with a stain or inclusions of chrysocolla, you have what is called "Gem Silica". This is not an official geological name, but that is what you most often see it listed as. more correctly, it might be called chryocolla chalcedony. Chrysocolla is found in many locations, incl. the southwest US, Mexico, Peru, Africa and Australia. Gem Silica is mostly found in Arizona and Peru, though the Arizona material is relatively scarce now and mostly comes from 'old stock' finds.
