gemstone
Agate
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, waxy to vitreous luster, microcrystalline quartz structure with distinctive concentric banding, and specific gravity around 2.65.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, waxy to vitreous luster, microcrystalline quartz structure with distinctive concentric banding, and specific gravity around 2.65.
Formation & geological history
Forms by the deposition of silica from groundwater in cavities of igneous or sedimentary rocks, often over millions of years.
Uses & applications
Widely used in lapidary arts, jewelry, decorative ornaments, and precision instruments like mortars and pestles.
Geological facts
Agate was highly prized in ancient civilizations as a talisman and for making intricate intaglio seals and cameos.
Field identification & locations
Identify by its waxy luster, conchoidal fracture, and characteristic colorful banding patterns; found worldwide in volcanic rock cavities.
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