mineral
Chalcedony
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, typically white, grey, or blue in color, waxy to vitreous luster, cryptocrystalline structure, and conchoidal fracture.
Identified More mineral →
Explore Chalcedony in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6.5 to 7 on the Mohs scale, typically white, grey, or blue in color, waxy to vitreous luster, cryptocrystalline structure, and conchoidal fracture.
Formation & geological history
Formed through the deposition of silica-rich groundwater within cavities and fissures of rocks at low temperatures.
Uses & applications
Commonly used in making ornamental carvings, beads, and affordable jewelry pieces.
Geological facts
Chalcedony is the cryptocrystalline form of silica, serving as the parent material for several other gemstone varieties like agate and jasper.
Field identification & locations
Identified by its waxy luster and conchoidal fracture, often found globally in volcanic and sedimentary rock cavities.
