gemstone
Agate
Chalcedony (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy luster, and displays distinct concentric color banding. It has a microcrystalline quartz structure with no visible cleavage.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy luster, and displays distinct concentric color banding. It has a microcrystalline quartz structure with no visible cleavage.
Formation & geological history
Formed through the deposition of silica-rich groundwater within cavities of volcanic and metamorphic rocks over millions of years.
Uses & applications
Widely used in jewelry, ornamental carvings, decorative slices, and industrial grinding tools or mortars.
Geological facts
Agate was named by Theophrastus after the Achates River in Sicily. Ancient civilizations prized it for amulets and seals.
Field identification & locations
Easily identified by its translucent banded layers and conchoidal fracture. Found worldwide, particularly in Brazil, Uruguay, and the western United States.
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