gemstone
Tumbled Agate
Silicon Dioxide (Quartz variety: Chalcedony)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, translucent to opaque, waxy to vitreous luster, microcrystalline crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.64.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, translucent to opaque, waxy to vitreous luster, microcrystalline crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.64.
Formation & geological history
Formed by the deposition of silica from groundwater in the cavities of igneous and sedimentary rocks, often developing in concentric layers over millions of years.
Uses & applications
Widely used in jewelry, ornamental carvings, polished display stones, and metaphysical collections.
Geological facts
Agate has been used since ancient times (dating back to the Neolithic period) for seals, amulets, and adornments. The name comes from the Achates River in Sicily where agates were found in antiquity.
Field identification & locations
Can be identified by its waxy luster, hardness, and often banded appearance (though tumbled pieces may show cloudy or mottled patterns). Commonly found worldwide, notably in Brazil, India, Madagascar, and the United States.
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