mineral
Polished brown pebble, likely jasper or iron-stained quartzite
Uncertain; possible microcrystalline quartz (SiO₂) with iron-oxide staining
AI-generated identification · may be incorrectSmoothly polished, opaque tan-brown surface with a darker seam or natural fracture. Likely hardness about 6.5–7 Mohs, vitreous to dull luster, massive rather than visibly crystalline, and probably specific gravity around 2.6–2.7.
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Physical properties
Smoothly polished, opaque tan-brown surface with a darker seam or natural fracture. Likely hardness about 6.5–7 Mohs, vitreous to dull luster, massive rather than visibly crystalline, and probably specific gravity around 2.6–2.7.
Formation & geological history
If jasper or quartzite, it formed from silica-rich material later cemented or metamorphosed, with iron oxides producing the brown color; exact age and provenance cannot be determined from the photograph.
Uses & applications
Used as a tumbled stone, ornament, paperweight, or cabochon material; generally not valuable as jewelry-grade material unless it has distinctive patterns or confirmed provenance.
Geological facts
The seam may be a healed fracture, vein, or boundary between color zones rather than a manufactured cut. Surface appearance alone cannot reliably distinguish jasper from quartzite, chert, or ordinary river stone.
Field identification & locations
Likely identifiable by its very smooth polish, opaque earthy color, and absence of visible grains; a streak, hardness test, and close examination of the fracture are needed for confirmation. Similar stones occur widely in gravel beds and silica-rich terrains.
