metamorphic

Tumbled tan stone, likely quartzite or jasper

Quartz-rich quartzite (SiO₂) or opaque jasper (microcrystalline quartz)

AI-generated identification · may be incorrect

Small, rounded and polished; tan-brown, opaque, with a smooth surface and dull-to-waxy luster. Likely hardness 6.5–7 Mohs, no visible cleavage, and specific gravity about 2.6–2.7; the image alone cannot distinguish quartzite from jasper confidently.

Identified September 8, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartzite forms when quartz-rich sandstone is metamorphosed under heat and pressure; jasper forms from silica-rich sediment or volcanic fluids. Ages vary widely, from Precambrian to recent, depending on source.

Uses & applications

Commonly sold as a tumbled stone for crafts, cabochons, collections, and decorative use; quartzite is also used as aggregate and dimension stone, while jasper has ornamental value.

Geological facts

The rounded shape and uniform polish indicate human tumbling rather than natural weathering. A true quartz-rich specimen should scratch ordinary glass but not be scratched by a steel blade.

Field identification & locations

Commonly sourced from quartzite and jasper deposits worldwide, including India, Brazil, Madagascar, and the United States. Exact identification requires a scratch test, streak, translucency check, and ideally microscopic or chemical analysis.