gemstone
Fire Agate
Chalcedony (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, waxy to vitreous luster, amorphous or cryptocrystalline structure, and displays iridescent play-of-color.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, waxy to vitreous luster, amorphous or cryptocrystalline structure, and displays iridescent play-of-color.
Formation & geological history
Formed through hot, silica-rich groundwater filling cavities in volcanic rock millions of years ago.
Uses & applications
Cut and polished into cabochons for rings, pendants, and high-end gemstone collections.
Geological facts
The iridescent fire effect is caused by interference of light passing through thin alternating layers of chalcedony and limonite.
Field identification & locations
Found mainly in the southwestern United States and Mexico, identified by its botryoidal habit and internal rainbow flash.
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