gemstone
Mexican Cantera Opal
Hydrated amorphous silica (SiO2·nH2O) in rhyolite matrix
AI-generated identification · may be incorrectMohs hardness 5.5 to 6.5, specific gravity 2.1 to 2.3, vitreous to waxy luster, amorphous crystal structure, exhibits colorful play-of-color embedded in porous host rock.
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Physical properties
Mohs hardness 5.5 to 6.5, specific gravity 2.1 to 2.3, vitreous to waxy luster, amorphous crystal structure, exhibits colorful play-of-color embedded in porous host rock.
Formation & geological history
Formed in cavities of volcanic rhyolite lava flows through low-temperature precipitation of silica-rich groundwater over millions of years.
Uses & applications
Cut into cabochons for rings, pendants, and high-end jewelry as well as valued by mineral collectors.
Geological facts
Cantera opals are unique because the precious opal remains securely attached to its natural volcanic host rock matrix, creating stunning contrast.
Field identification & locations
Identified by distinct vibrant orange, red, or green flashes of color encased within porous white or pinkish rhyolite stone; primarily sourced from Querétaro, Mexico.
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