sedimentary
Chalcedony
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy luster, and conchoidal fracture. Displays translucent to opaque white and brownish coloration with a cryptocrystalline structure.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy luster, and conchoidal fracture. Displays translucent to opaque white and brownish coloration with a cryptocrystalline structure.
Formation & geological history
Formed through the deposition of silica-rich groundwater within cavities of sedimentary or volcanic rocks at low temperatures.
Uses & applications
Commonly used in ornamental carvings, gemstone jewelry, and lapidary art.
Geological facts
Ancient cultures frequently carved chalcedony into intaglios and seals due to its durability and resistance to sticking to wax.
Field identification & locations
Identify by its waxy luster and conchoidal fracture, often found lining geodes in volcanic regions worldwide.
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