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Rosasite: (Cu,Zn)2(CO3)(OH)2
Comments: Rosasite on malachite after azurite. Blocky crystals of azurite to 2.5 cm in size, completely altered to malachite, then coated by pale sky-blue rosasite. Location: Silver Bill mine, Gleeson, Cochise Co., Arizona, USA. Scale: 4 x 7.5 x 2 cm. © Dan Weinrich