gemstone
Agate
Silicon dioxide (Chalcedony), SiO2
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, waxy luster, concoidal fracture, and variable translucent banded colors.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, waxy luster, concoidal fracture, and variable translucent banded colors.
Formation & geological history
Forms by the deposition of silica from groundwater in the cavities of igneous and sedimentary rocks over millions of years.
Uses & applications
Widely used in jewelry, decorative ornaments, gemstone carvings, and industrial abrasive bearings.
Geological facts
Agate was highly prized in ancient civilizations like Egypt and Greece for creating signet rings, amulets, and ornate vessels.
Field identification & locations
Easily identified by its distinct concentric color bands and smooth waxy feel; globally sourced from Brazil, India, and the USA.
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