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Quartz crystals with adularia (orthoclase) from Dona Anna Co., New Mexico. Photograph courtesy of the New Mexico Bureau of Geology and Mineral Resources. From AAPG Memoir 109—A Color Guide to the Petrography of Sandstones, Siltstones, Shales, and Associated Rocks, [http://store.aapg.org/detail.aspx?id=1250 Chapter 1].