- A carbonate-rich variety of Cyanotrichite, where the sulfate radical (SO4) is partially replaced by a carbonate radical (CO2). Its chemical formula is Cu4Al2(CO3,SO4)(OH)12 · 2H2O. Carbonatecyanotrichite is technically not really a variety since it is scientifically recognized as as a distinct mineral species, though it is identical to Cyanotrichite and virtually indistinguishable.
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Cyanotrichite is a rare mineral, thus it is a very insignificant ore of copper. It is popular as a micromount mineral.
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European localities include Cap Garonne and Salsigne, France; Wheal Basset, Cornwall, England; and Lavrion, Greece. One of the best producers of this mineral is in the Vieja Mine in Potrerillos, Chanaral Province, Chile. Good Cyanotrichite also comes from Qinglong, Guizhou Province, China.
In the U.S., this mineral has several good localities in Arizona, specifically the Grandview Mine near the Grand Canyon, in Concino Co.; the Copper Queen Mine in Bisbee, Cochise Co.; and the Maid of Sunshine Mine, Cortland, Cochise Co. Cyanotrichite also comes from the American Eagle Mine in the Tintic District in Juab Co., Utah; the Peacock Mine, Lemhi Co., Idaho; and the Majuba Hill mine, Pershing Co., Nevada.
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Aurichalcite - Greener color.
Azurite - Usually darker blue.
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