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wigmund: From Mindat.Org Photo Of The Day; November 6, 2016: Conichalcite: CaCu(AsO4)(OH); Quartz: SiO2 Locality: Gold Chain Mine, Mammoth, Tintic District, East Tintic Mts, Juab Co., Utah, USA Green crystalline spheres of Conichalcite on Quartz that has been slightly stained … Continue reading →