Diamond News
Fire agate is a variety of chalcedony, a micro or cryptocrystalline quartz. With its swirling flares...
GIAFire agate is a variety of chalcedony, a micro or cryptocrystalline quartz. With its swirling flares of orange iridescence and flashing streaks of brown, yellow and green, it is aptly named. It forms in botryoidal structure, resembling a cluster of grapes. Fire agate is an excellent example of the iridescence phenomenon seen in chalcedony. Photo: Robert Weldon/GIA. Courtesy: Commerical Mineral Company, Inc.
