mineral

Small tumbled brown stone, likely iron-stained quartz or jasper

Quartz (SiO₂) or microcrystalline quartz (chalcedony/jasper), identification uncertain from the image

AI-generated identification · may be incorrect

Smooth, rounded, opaque tan-brown surface with a dull to waxy luster; quartz hardness is about 7 Mohs, while jasper is typically 6.5–7. Crystal structure is trigonal for quartz and cryptocrystalline for jasper; cleavage is absent.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Likely a naturally weathered or commercially tumbled silica-rich pebble, with brown coloration from iron oxides. Such material commonly forms in volcanic or sedimentary environments, from Precambrian to Recent ages.

Uses & applications

Used as a decorative tumbled stone, craft material, or inexpensive collector specimen; jasper and quartz are also used in lapidary work and jewelry.

Geological facts

The smooth shape and uniform polish suggest tumbling rather than natural rounding. A streak, hardness, translucency, and close-up examination would distinguish quartz from jasper or brown glass.

Field identification & locations

Commonly found in river gravels and silica-rich deposits worldwide; test whether it scratches glass and inspect for internal translucency or banding. The pictured object could also be a non-geological bead or resin piece, so visual identification is provisional.