mineral

Tumbled banded agate or jasper

Microcrystalline quartz (chalcedony), SiO₂, likely with iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; cream, tan, and gray coloration with irregular fibrous or layered banding; waxy to dull luster. The specimen appears naturally rounded and polished/tumbled, with no obvious cleavage and low visible crystal grain.

Identified September 10, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich groundwater filled cavities or fractures in volcanic rock, depositing chalcedony in successive layers; iron compounds produced the tan coloration. Exact geological age and locality cannot be determined from the image.

Uses & applications

Used as a lapidary stone for cabochons, carvings, beads, and decorative objects; attractive pieces have modest collecting value.

Geological facts

The layered texture may represent agate-like chalcedony, but the image is insufficient to distinguish it confidently from silicified jasper or another quartz-rich rock.

Field identification & locations

Identify by its very high hardness, glass-scratching capability, waxy appearance, and fine cryptocrystalline texture; it should not show obvious cleavage. Common sources include Brazil, Uruguay, Mexico, India, Madagascar, and the western United States.