gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, varied colors including brown, white, and amber, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture with no cleavage, specific gravity of 2.58 to 2.64.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, varied colors including brown, white, and amber, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture with no cleavage, specific gravity of 2.58 to 2.64.
Formation & geological history
Formed mainly within cavities of volcanic and metamorphic rocks by the deposition of silica from groundwater solutions, often in concentric layers.
Uses & applications
Used for jewelry, ornamental carvings, decorative objects, and industrial bearings.
Geological facts
Agate is one of the most popular materials used in hardstone carving and was prized as a talisman in ancient civilizations.
Field identification & locations
Found worldwide, often in river gravels and volcanic rock cavities. Identify by its distinctive banding and translucent edges when held to light.
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