gemstone
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure with conchoidal fracture, and specific gravity around 2.6.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure with conchoidal fracture, and specific gravity around 2.6.
Formation & geological history
Forms by the deposition of silica from groundwater in cavities of igneous and sedimentary rocks over millions of years.
Uses & applications
Widely used for polished decorative stones, jewelry, tumbling specimens, and crystal healing collections.
Geological facts
Agate bands represent successive layers of microscopic quartz crystals deposited inside hollow rock cavities.
Field identification & locations
Identified by its fine grain, translucent appearance, and curved concentric banding when polished or sliced.
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