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. Most of these are hollow on the inside and if they don’t have much matrix attached, they will even float in water! Philip Simmons collection; Philip Simmons and Erin Delventhal photo.