gemstone
Tumbled Agate
Silicon Dioxide (Chalcedony / Quartz)
Hardness of 6.5 to 7 on the Mohs scale, varies in color with earthy tones like brown, translucent to opaque, waxy to vitreous luster, microcrystalline crystal structure, conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, varies in color with earthy tones like brown, translucent to opaque, waxy to vitreous luster, microcrystalline crystal structure, conchoidal fracture.
Formation & geological history
Formed by the deposition of silica from groundwater in cavities of igneous and sedimentary rocks over millions of years.
Uses & applications
Commonly used for jewelry, lapidary arts, metaphysical purposes, and as collector specimens.
Geological facts
Agate has been used since antiquity for ornamentation, seals, and protective amulets due to its durability and rich banding.
Field identification & locations
Found worldwide in riverbeds and gravel deposits; easily identified in the field by its smooth, water-worn exterior and waxy luster.
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