sedimentary
Blue Agate
Silicon dioxide (Chalcedony), SiO2
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, microcrystalline crystal structure, and conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, microcrystalline crystal structure, and conchoidal fracture.
Formation & geological history
Formed by the deposition of silica from groundwater in cavities of igneous and sedimentary rocks over millions of years.
Uses & applications
Widely used in ornamental jewelry, decorative carvings, tumbling, and metaphysical practices.
Geological facts
Agate bands represent successive layers of silica deposition reflecting changing environmental conditions during formation.
Field identification & locations
Identified by its distinct translucent banding, waxy feel, and ability to scratch glass; found globally in volcanic rock cavities.
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