Arizona Gem Silica Chrysocolla also known as “Chrysocolla Chalcedony,” is the rarest and most expensive variety in the quartz family a type of chalcedony known in the trade as Gem Silica; Gem Silica Chrysocolla. Gem silica is a rare form of silica that is most often found coincident with copper deposits in a small number of localities around the world including the U.S., Mexico, and Peru. Silica is a clear mineral in most instances but when colored by the inclusion of copper it can take on the most beautiful hues of blue. It is a very hard/durable material and can range from blue to blue/green in color and may have sprays of malachite or other minerals. The most prized (gem quality) material came from small deposits found around copper mines in Arizona ( Ray Mine and the Miami/Inspiration Mine ) but unfortunately these mines have produced no material since the 1970s. This material is considered to be the best of the best in terms of color.

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