mineral

Polished banded agate (possibly Botswana agate)

Banded chalcedony, microcrystalline SiO₂

AI-generated identification · may be incorrect

A rounded, polished gray-brown stone with translucent, curved bands. Quartz hardness 6.5–7 Mohs; vitreous to waxy luster, trigonal crystal structure at microscopic scale, and no visible cleavage. The photo does not show enough detail to confirm the exact agate variety.

Identified October 12, 2026More mineral →

Explore Polished banded agate (possibly Botswana agate) in the encyclopedia →

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Physical properties

Formation & geological history

Agate bands form as silica-rich water deposits successive layers in cavities, often in volcanic rock; the specimen’s geological age and locality cannot be determined from the image.

Uses & applications

Used for cabochons, jewelry, ornaments, and collecting; agate is also used for small precision components and decorative objects.

Geological facts

Agate is chalcedony, a variety of quartz, and its banding records changes in mineral-rich fluids during growth.

Field identification & locations

Look for fine curved or concentric bands and a hard, glassy-to-waxy surface; common sources include Brazil, Uruguay, India, and Botswana. A locality label or magnified view would help verify the variety.