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 incorrectSmooth, 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.
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Physical properties
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.
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.
