mineral
Polished fire agate
Chalcedony (microcrystalline quartz, SiO₂) with iron-oxide inclusions
AI-generated identification · may be incorrectOrange-red, glossy, and apparently polished, with pale banding; quartz hardness 6.5–7 and trigonal crystal structure. The small image does not show enough detail to confirm characteristic iridescence or identify the material conclusively.
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Physical properties
Orange-red, glossy, and apparently polished, with pale banding; quartz hardness 6.5–7 and trigonal crystal structure. The small image does not show enough detail to confirm characteristic iridescence or identify the material conclusively.
Formation & geological history
Forms as silica fills cavities and fractures in volcanic rocks; iron oxides create its warm colors. Deposits are mainly Cenozoic, though the specimen’s exact age and source cannot be determined from the image.
Uses & applications
Used in cabochons, beads, and other jewelry, as well as mineral collections.
Geological facts
True fire agate displays shifting iridescent flashes caused by thin layers of iron oxide within chalcedony.
Field identification & locations
Check for natural-looking color bands and moving iridescence under angled light; fire agate is notably associated with Arizona and northern Mexico. The pictured stone could also be another orange banded agate or polished material.
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