gemstone
Agate
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure with variable colors including grey, brown, and blue, and conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure with variable colors including grey, brown, and blue, and conchoidal fracture.
Formation & geological history
Formed by the deposition of silica from groundwater in the cavities of igneous and sedimentary rocks over millions of years.
Uses & applications
Used primarily in jewelry, ornamental carvings, decorative objects, and precision instruments.
Geological facts
Agate is a common variety of chalcedony and often exhibits distinct concentric banding formed by successive layers of silica deposition.
Field identification & locations
Identified by its waxy luster, hardness that scratches glass, and banded or translucent appearance. Commonly found in volcanic rock cavities worldwide.
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