gemstone
Fire Agate
SiO2 (Chalcedony variety)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, vitreous to waxy luster, and botryoidal crystal habit with iridescent interference colors.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, vitreous to waxy luster, and botryoidal crystal habit with iridescent interference colors.
Formation & geological history
Formed in volcanic cavities by hot silica-rich groundwater interacting with iron oxide deposits during the Tertiary period.
Uses & applications
Primarily used as a semi-precious gemstone in bespoke jewelry, highly prized by collectors for its fiery iridescence.
Geological facts
The rainbow fire effect is caused by light diffraction through thin alternating layers of chalcedony and limonite plate crystals.
Field identification & locations
Identified by its characteristic botryoidal structure and flashing iridescent colors; predominantly found in the southwestern United States and Mexico.
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