mineral

Polished banded agate

Agate, a microcrystalline variety of quartz (SiO₂)

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent orange, cream, and white bands with a waxy to vitreous luster. Microcrystalline, with no visible cleavage; specific gravity about 2.6.

Identified October 12, 2026More mineral →

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Physical properties

Hardness 6.5–7 Mohs; translucent orange, cream, and white bands with a waxy to vitreous luster. Microcrystalline, with no visible cleavage; specific gravity about 2.6.

Formation & geological history

Agate forms as silica-rich fluids fill cavities in volcanic rock, depositing successive layers. The exact age and locality cannot be determined from the photo.

Uses & applications

Used for jewelry, beads, ornaments, and lapidary pieces; the specimen shown is shaped and polished.

Geological facts

Agate’s bands record changes in silica deposition and trace impurities during formation.

Field identification & locations

Recognize it by curved, contrasting bands and hardness sufficient to scratch glass; agates occur worldwide, commonly in volcanic rocks and stream gravels. Similar small polished pieces typically sell for about $2–$15 USD.