mineral

Polished pink banded agate

Banded chalcedony (microcrystalline quartz, SiO₂), likely dyed or naturally vivid pink

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent to opaque, waxy-to-glassy luster, with curved concentric bands of pink, magenta, white, and gray. Quartz has trigonal crystal structure, but chalcedony is cryptocrystalline and lacks visible cleavage; specific gravity is about 2.6.

Identified August 31, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities in volcanic rocks, depositing successive layers of chalcedony over long periods, commonly during the Cenozoic or older volcanic episodes. The intense pink color may be natural or enhanced by dyeing.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and small display specimens; it is popular for affordable jewelry and lapidary work.

Geological facts

Agate is a variety of chalcedony distinguished by banding; each band records changing chemistry or conditions during cavity filling. Polishing strongly reveals the internal pattern.

Field identification & locations

Identify it by its fine curved banding, smooth waxy surface, and quartz-like hardness; it should resist scratching by a steel knife but scratch glass. Common sources include Brazil, Uruguay, Mexico, India, and Madagascar.