gemstone
Fire Opal
Hydrated amorphous silica (SiO2·nH2O)
AI-generated identification · may be incorrectMohs hardness 5.5-6.5; displays translucent to transparent body colors of yellow, orange, or red with vitreous luster and conchoidal fracture.
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Physical properties
Mohs hardness 5.5-6.5; displays translucent to transparent body colors of yellow, orange, or red with vitreous luster and conchoidal fracture.
Formation & geological history
Formed from silica-rich groundwater filling volcanic cavities at low temperatures, predominantly found in Mexico.
Uses & applications
Extensively cut and polished into cabochons for rings, pendants, and high-end jewelry collections.
Geological facts
Unlike precious opal, fire opal is prized for its intense body color rather than a strong play of color.
Field identification & locations
Identified by its warm vibrant body colors and vitreous luster; typically sourced from volcanic regions.
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