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Macquartite: Pb3Cu(CrO4)(SiO3)(OH)4·2(H2O)
Comments: Straw-like prismatic yellow micro crystals of macquartite to about 0.5mm on matrix. Location: Mammoth - St. Anthony mine, Tiger, Pinal Co., Arizona, USA. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Comments: Bright yellow, prismatic crystals of macquartite in radial sprays to 0.75mm. Location: Tiger, Mammoth district, Pinal County, Arizona, USA. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix