mineral

Pink agate (likely dyed or coated)

Microcrystalline quartz, SiO₂ (chalcedony/agate)

AI-generated identification · may be incorrect

Polished, translucent pink-red stone with cloudy or weakly banded chalcedony texture. Quartz hardness is Mohs 7, vitreous to waxy luster, cryptocrystalline structure, no visible cleavage, and specific gravity about 2.6; the vivid color may result from dyeing.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Agate forms when silica-rich groundwater fills cavities in volcanic rock, depositing layers of chalcedony over long periods, commonly during the Cenozoic or older volcanic episodes. This tumbled specimen has been cut and polished.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and inexpensive jewelry; agate is also collected for its patterns and color. Typical value is decorative rather than gem-investment value.

Geological facts

Natural pink agate exists, but intensely uniform pink or red coloration commonly indicates treatment. Agate’s banding reflects repeated changes in fluid chemistry during cavity filling.

Field identification & locations

Look for curved or concentric bands, translucency at thin edges, and hardness sufficient to resist scratching by steel; glass should not scratch quartz. Common sources include Brazil, Uruguay, India, Madagascar, and Mexico.