Photo by Philip Simmons and Erin Delventhal

Chalcedony

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Chalcedony, two views showing fluorescence under short-wave ultraviolet, 6.2 cm, from the Green Fire prospect, Cochise County, Arizona; collected with Mike Sanders and Erin Delventhal. Unusually shaped “UFO’s”, most are hollow and can float in water. Philip Simmons collection; Philip Simmons and Erin Delventhal photo.