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zircon; lustrous dark brown bipyramidal crystals in rusty quartz

Cheyenne Canyon, [El Paso County], Colorado, [USA] [Proterozoic], [Precambrian] [Pike Peak Batholith] [ca. 1.08Ga] Nice specimen - sharp crystals up to 7mm on edge. Mildly radioactive (ca. 10 cps on Geiger counter). This may be from the locality also known as "Helen Hunt Falls".