mineral

Agate

Silicon dioxide (SiO2)

Hardness: 6.5-7. Color: Translucent grey, white, and orange-tinted bands. Luster: Waxy to vitreous. Crystal structure: Trigonal/Microcrystalline. Specific gravity: 2.58-2.64.

Hardness: 6
Color: Translucent grey, white, and orange-tinted bands
Luster: Waxy to vitreous

Identified July 10, 2026More mineral →

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Physical properties

Hardness: 6.5-7. Color: Translucent grey, white, and orange-tinted bands. Luster: Waxy to vitreous. Crystal structure: Trigonal/Microcrystalline. Specific gravity: 2.58-2.64.

Formation & geological history

Formed in cavities of volcanic rocks or ancient lavas, where silica-rich groundwater deposited layers of chalcedony over long periods of time.

Uses & applications

Used primarily in lapidary arts for jewelry, decorative carvings, and as a gemstone for collectors.

Geological facts

The name comes from the Achates River in Sicily where agates were first found in ancient times. They are known for their distinct concentric banding patterns.

Field identification & locations

Identify by its translucency and banding. Commonly found in riverbeds or areas of volcanic activity. This specimen appears to be a water-worn or tumbled river agate.