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Fornacite: Pb2Cu(CrO4)(AsO4)(OH)
Comments: Emerald green platy crystals to 0.75mm on a pink to white, siliceous matrix. Location: Lone Star mine, Copperopolis, Yavapai County, Arizona. Scale: Picture size 1.4 cm. © Tom Loomis / Dakota Matrix
Comments: Dark, prismatic crystals of fornacite on matrix. Location: El Khun mine, Anarak, Iran. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals