metamorphic

Tumbled brown stone, likely quartzite or jasper

Indeterminate; probable quartz-rich aggregate (SiO₂), possibly brown jasper

AI-generated identification · may be incorrect

Small, rounded and polished; tan-brown color with faint mottling, dull to weakly glossy luster, and no visible cleavage. Likely hardness about 6.5–7 Mohs and specific gravity near 2.6–2.7, though the photograph cannot confirm composition.

Identified September 7, 2026More metamorphic →

Explore Tumbled brown stone, likely quartzite or jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Probably a naturally rounded or mechanically tumbled quartz-rich rock; quartzite forms when sandstone is metamorphosed, while jasper forms as microcrystalline silica precipitates or replaces sediment. Exact age and locality are indeterminate.

Uses & applications

Commonly used as a decorative tumbled stone, craft material, or inexpensive cabochon; quartzite also has aggregate and construction uses.

Geological facts

The smooth shape and surface reflect tumbling or water wear rather than crystal growth. Brown coloration may result from iron oxides such as hematite or goethite.

Field identification & locations

Test with a steel file or glass: a quartz-rich specimen should scratch glass and resist a steel knife. Common sources include quartzite and jasper deposits worldwide; identification requires hardness, streak, translucency, and a fresh surface.