sedimentary
Agate
Silicon dioxide (chalcedony), SiO2
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, waxy luster, microcrystalline crystal structure, and conchoidal fracture with distinct banding.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, waxy luster, microcrystalline crystal structure, and conchoidal fracture with distinct banding.
Formation & geological history
Formed through the deposition of silica-rich groundwater within cavities of volcanic or sedimentary rocks over millions of years.
Uses & applications
Used widely in ornamental carvings, jewelry, polished specimens, and precision instruments like mortars and pestles.
Geological facts
Agate bands represent successive layers of silica deposition reflecting changes in environmental conditions during formation.
Field identification & locations
Easily identified by its translucent to opaque banded appearance and conchoidal fracture; commonly found globally in volcanic regions.
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