mineral

Tumbled brown-and-white banded agate

Chalcedony, microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

Likely Mohs hardness 6.5–7; brown, cream, and translucent gray bands with a waxy-to-glassy luster. Quartz crystals are microscopic; the specimen appears rounded and polished, so natural cleavage is not evident.

Identified September 29, 2026More mineral →

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Physical properties

Formation & geological history

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

Uses & applications

Commonly cut and polished for jewelry, ornaments, and collectibles; agate is also used for small decorative objects and historically for precision components.

Geological facts

Agate’s distinctive bands record changing conditions as silica accumulated in layers. The specimen’s polish may make its original surface texture difficult to assess.

Field identification & locations

Look for curved or concentric bands and a hard, glassy, often translucent surface; agate occurs worldwide, especially in volcanic regions and stream gravels. The photo suggests banded chalcedony, but identification is tentative without closer inspection.