mineral
Tumbled Agate
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale. Colors range from translucent gray, yellow, brown, and white with banded or mottled patterns. Vitreous to waxy luster. Cryptocrystalline quartz structure (chalcedony) with no distinct cleavage and a conchoidal fracture. Specific gravity is approximately 2.60 to 2.65.
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Physical properties
Hardness of 7 on the Mohs scale. Colors range from translucent gray, yellow, brown, and white with banded or mottled patterns. Vitreous to waxy luster. Cryptocrystalline quartz structure (chalcedony) with no distinct cleavage and a conchoidal fracture. Specific gravity is approximately 2.60 to 2.65.
Formation & geological history
Formed by the deposition of silica from groundwater, usually in the cavities of igneous rocks such as basalt or in sedimentary formations. Geological age varies widely from Precambrian to recent formations.
Uses & applications
Commonly used for tumbled stones, decorative ornaments, lapidary art, jewelry, and metaphysical healing collections.
Geological facts
Agate is a variety of chalcedony that often forms in concentric bands around a core. Ancient civilizations valued agates for amulets and healing talismans.
Field identification & locations
Easily recognized by its waxy luster, hardness that can scratch glass, and smooth tumbled surface. Found worldwide, with notable deposits in Brazil, India, Madagascar, and the United States.
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