gemstone
Black Agate
Silicon Dioxide (Chalcedony), SiO2
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, and conchoidal fracture. It displays distinct dark grey to black bands.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, and conchoidal fracture. It displays distinct dark grey to black bands.
Formation & geological history
Formed by the deposition of silica from groundwater in the cavities of igneous and sedimentary rocks over millions of years.
Uses & applications
Widely used in making jewelry, ornamental carvings, polished display specimens, and metaphysical practices.
Geological facts
Agate has been utilized by humans since ancient Neolithic times for ornaments, healing amulets, and making seals.
Field identification & locations
Identified by its waxy luster, microcrystalline texture, and distinct concentric banding. Commonly sourced from Brazil, India, and the USA.
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