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Tenorite: CuO Chrysocolla: (Cu,Al)2H2Si2O5(OH)4·n(H2O)
Comments: Lustrous black botryoidal Tenorite mostly covering a sky-blue massive chrysocolla matrix. Location: 79 mine, Banner district, Pinal Co., Arizona. Scale: 5.5 x 3 cm. © Dan Weinrich