gemstone
Tumbled Agate
Silicon Dioxide (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, microcrystalline quartz structure (chalcedony), conchoidal fracture, specific gravity of 2.58 to 2.64.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, microcrystalline quartz structure (chalcedony), conchoidal fracture, specific gravity of 2.58 to 2.64.
Formation & geological history
Formed by the deposition of silica from groundwater in cavities of igneous and sedimentary rocks, typically over millions of years.
Uses & applications
Commonly used in jewelry, lapidary arts, decorative items, and as a popular specimen for mineral collectors.
Geological facts
Agate has been used since antiquity for ornaments, seals, and healing talismans, famously mined in ancient times along the Achates River in Sicily.
Field identification & locations
Identifiable by its translucent to opaque appearance, microcrystalline texture, and smooth tumbled finish. Found worldwide in volcanic and sedimentary deposits.
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