gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, conchoidal fracture, and typically exhibits multicolored banding.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, conchoidal fracture, and typically exhibits multicolored banding.
Formation & geological history
Forms by the deposition of silica from groundwater in cavities of igneous and sedimentary rocks, often over millions of years.
Uses & applications
Used primarily in jewelry, decorative carvings, ornamental objects, and precision instruments.
Geological facts
Agate is one of the most popular stones used in lapidary art and was historically valued as an amulet against storms and thirst.
Field identification & locations
Identified by its characteristic concentric bands and waxy sheen, commonly found worldwide in volcanic rock cavities and riverbeds.
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