mineral

Polished pink banded agate

Microcrystalline quartz (chalcedony), SiO₂

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, vitreous to waxy luster, translucent to opaque, with pink-tan coloration and curved cream banding; quartz is trigonal but occurs as cryptocrystalline fibers, with no visible cleavage and specific gravity about 2.60–2.65.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Agate forms when silica-rich groundwater repeatedly fills cavities in volcanic rock, depositing chalcedony and quartz bands. The specimen is polished and likely formed in Phanerozoic volcanic environments, though its exact age and locality cannot be determined from the image.

Uses & applications

Used for cabochons, beads, spheres, ornaments, bookends, and lapidary carvings; generally decorative rather than industrial in this polished form.

Geological facts

The concentric or curved bands record changing fluid chemistry and growth conditions. Pink coloration may result from iron oxides, microscopic inclusions, or occasional dye treatment, which cannot be confirmed visually.

Field identification & locations

Identify by its smooth conchoidal fracture, waxy translucence, hardness, and natural curved banding; common sources include Brazil, Uruguay, Mexico, India, Madagascar, and the United States. Avoid confusing it with dyed glass or resin.