gemstone
Agate
Silicon dioxide (chalcedony variety)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, microcrystalline structure, and distinct concentric banding.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, microcrystalline structure, and distinct concentric banding.
Formation & geological history
Forms by the deposition of silica from groundwater in cavities of igneous and sedimentary rocks over millions of years.
Uses & applications
Widely used in jewelry, decorative ornaments, and precision instruments due to its durability.
Geological facts
Agate was highly prized in the ancient world for use in signet rings and ornate talismans.
Field identification & locations
Easily identified by its characteristic translucent bands and conchoidal fracture; commonly found worldwide.
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