gemstone
Fire Agate
Silicon Dioxide (Chalcedony with Limonite inclusions)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy luster, and botryoidal crystal structure. Displays iridescent rainbow colors caused by interference of light through thin layers of limonite.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy luster, and botryoidal crystal structure. Displays iridescent rainbow colors caused by interference of light through thin layers of limonite.
Formation & geological history
Formed millions of years ago in volcanic cavities where hot, silica-rich groundwater deposited layers of chalcedony over iron oxide crystals.
Uses & applications
Used primarily in high-end artisan jewelry and lapidary collections as cabochons.
Geological facts
Fire agate is prized for its intense, fiery iridescence that resembles burning embers under the right lighting. It is found in very few locations worldwide.
Field identification & locations
Identified easily by its distinctive botryoidal 'grape-like' surface and flashing iridescent colors. Commonly mined in the southwestern United States and central Mexico.
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