CHALCOPYRITE and GUSTAVITE-LILLIANITE SERIES on QUARTZ and PYRITE Pedro Claim, Middle Fork of the Snoqualmie River, Snoqualmie Mining District, King County, Washington, USA Specimen is approximately 20 cm wide x 15 cm tall This outstanding specimen exhibits large twinned iridescent chalcopyrite crystals with possibly the largest crystal of gustavite-lillianite series (the elongated earthy gray crystal in the center of the cluster) on a bed of quartz crystals with associated pyrite. Photograph courtesy of Stuart Wilensky of Wilensky Exquisite Minerals |