gemstone

Tumbled Agate

Silicon Dioxide (Chalcedony), SiO2

Hardness of 6.5 to 7 on the Mohs scale, colors vary widely including brown, green, white, and translucent, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.64.

Identified August 4, 2026More gemstone →

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Physical properties

Formation & geological history

Formed primarily within the cavities of volcanic and metamorphic rocks through the slow deposition of silica-rich groundwater solutions over millions of years.

Uses & applications

Commonly used in jewelry, decorative items, lapidary arts, and as a popular collectible specimen due to its smooth tumbled finish.

Geological facts

Agate is one of the most popular stones used in tumbling and lapidary work. Ancient civilizations used agates for healing amulets and ornaments dating back to the Neolithic period.

Field identification & locations

Easily identified by its smooth, polished texture and characteristic translucent banding or coloration when viewed against light. Found worldwide, with notable deposits in Brazil, India, and the United States.