mineral

Agate

Cryptocrystalline quartz, SiO2

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale. Color: Highly variable, this specimen is beige, white, and orange/brown. Luster: Waxy to vitreous. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.64.

Hardness: 6
Luster: Waxy to vitreous

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms in cavities of eruptive rocks or ancient lavas. Silica-rich fluids fill the cavities and deposit microscopic layers of quartz over millions of years.

Uses & applications

Used in jewelry, carved ornaments, and collected by rockhounds. Sometimes used industrially for precision pendulums or mortar and pestles due to its hardness.

Geological facts

Agate is named after the Achates River (now Dirillo) in Sicily, where it was first found. It is a variety of chalcedony.

Field identification & locations

Identified by its banded or patterned appearance and waxy luster. Commonly found worldwide, especially in volcanic areas. Collectors often look for unique patterns and banding.