gemstone
Chalcedony
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, and white to yellow-brown color.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, and white to yellow-brown color.
Formation & geological history
Forms in hydrothermal veins and cavities in volcanic rocks at low temperatures from silica-rich solutions.
Uses & applications
Widely used in jewelry making, ornamental carvings, and as a gemstone set in rings.
Geological facts
Chalcedony has been used since antiquity to create intaglios and seals due to its toughness.
Field identification & locations
Identified by its waxy luster, conchoidal fracture, and translucency; commonly found worldwide.
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