mineral
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 colors ranging from white to brownish-gray.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, and colors ranging from white to brownish-gray.
Formation & geological history
Formed at low temperatures from silica-rich solutions filling cavities in rocks, often in hydrothermal or weathering environments.
Uses & applications
Used in ornamental carvings, lapidary arts, jewelry, and gemstone collection.
Geological facts
Chalcedony is a cryptocrystalline form of silica, meaning its crystals are too small to be seen without high magnification.
Field identification & locations
Identified by its waxy luster and conchoidal fracture, commonly found worldwide in volcanic and sedimentary deposits.
