gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, waxy luster, microcrystalline structure, and displays varied multicolored banding.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, waxy luster, microcrystalline structure, and displays varied multicolored 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
Used extensively in jewelry, decorative carvings, ornamental objects, and precision instruments.
Geological facts
Agate was highly valued in antiquity as a talisman and used widely in ancient glyptic art for signet rings.
Field identification & locations
Identified by its conchoidal fracture and characteristic concentric color bands; commonly found in riverbeds and volcanic rock vesicles worldwide.
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