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, microcrystalline crystal structure, and conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, microcrystalline crystal structure, and conchoidal fracture.
Formation & geological history
Formed through the deposition of silica from groundwater in cavities of igneous and sedimentary rocks over millions of years.
Uses & applications
Commonly used in jewelry, ornamental carvings, lapidary art, and precision instruments.
Geological facts
Agates often form in concentric bands and have been valued as gemstones and talismans since ancient civilizations.
Field identification & locations
Identify by its waxy luster and banded patterns; found globally in volcanic rock cavities and river gravels.
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