gemstone
Fire Agate
Chalcedony quartz with goethite inclusions (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, botryoidal habit with iridescent play-of-color, waxy to vitreous luster, and specific gravity around 2.6.
Identified More gemstone →
Explore Fire Agate in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6.5-7 on the Mohs scale, botryoidal habit with iridescent play-of-color, waxy to vitreous luster, and specific gravity around 2.6.
Formation & geological history
Formed in hot spring cavities during the Tertiary period when silica-rich water deposited layers containing iron oxide over gas bubbles.
Uses & applications
Primarily used as a semi-precious gemstone in bespoke jewelry, highly prized by collectors for its unique rainbow iridescence.
Geological facts
The rainbow fire effect is caused by interference of light passing through extremely thin, alternating layers of chalcedony and goethite platelets.
Field identification & locations
Identified by its distinctive grape-like botryoidal surface and internal flash of red, green, and gold fire; found mainly in the southwestern USA and Mexico.
More like this
Other gemstone specimens
Ammolite
Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)
mineral
Gemstone Ring
N/A - Set piece of jewelry, likely Amethyst or Garnet with Diamond or CZ
gemstone
Amber
Succinite (Organic Gemstone)
mineral
Diamond and Gold Jewelry
Carbon (Diamond) / Au (Gold)
gemstone
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Pearl necklace
Pearl, primarily aragonite (CaCO₃) and conchiolin
gemstone