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Guanacoite: (Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2
Comments: Deep blue, bladed, glassy crystals of guanacoite to 0.75mm lining vugs of arhbarite.. Location: El Guanaco Mine, Guanaco, Taltal, Antofagasta Province, Chile. Scale: Picture Size 5mm. © Tom Loomis / Dakota Matrix