mineral

Polished banded agate

Agate, a banded variety of microcrystalline quartz (SiO₂; chalcedony)

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent honey-brown bands, vitreous to waxy luster, cryptocrystalline structure, no visible cleavage. The specimen is polished and appears naturally banded.

Identified September 27, 2026More mineral →

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Physical properties

Hardness 6.5–7 Mohs; translucent honey-brown bands, vitreous to waxy luster, cryptocrystalline structure, no visible cleavage. The specimen is polished and appears naturally banded.

Formation & geological history

Silica-rich groundwater deposited successive chalcedony layers in a cavity, likely in volcanic rock; agates formed in many geological periods, so age cannot be determined from appearance alone.

Uses & applications

Used for jewelry, cabochons, carvings, and decorative objects; also collected for its distinctive banding.

Geological facts

Agate’s bands form as silica-rich fluids deposit layers on cavity walls, sometimes producing concentric patterns.

Field identification & locations

Look for translucent chalcedony with curved or concentric bands and a waxy-to-glassy polish; common sources include Brazil, Uruguay, India, and the United States.