mineral

Tumbled brown jasper (likely)

Jasper, an opaque, microcrystalline variety of quartz (SiO₂)

AI-generated identification · may be incorrect

Appears smooth and rounded from tumbling, with a reddish-brown color and subdued luster. Quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage; the image alone cannot confirm the exact variety.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms as silica-rich fluids fill cavities or replace material in sedimentary and volcanic rocks; its age depends on the host deposit and may range from millions to billions of years.

Uses & applications

Used for beads, cabochons, ornaments, and small decorative objects; common tumbled pieces have modest collector value.

Geological facts

Jasper’s colors and patterns arise from mineral impurities, commonly iron oxides. It is a variety name rather than a single precisely defined mineral species.

Field identification & locations

Look for an opaque, dense stone that resists scratching by a steel knife and may leave a white streak; jasper occurs worldwide in silica-rich deposits. This polished specimen’s identification is tentative from appearance alone.