sedimentary or metamorphic

Tumbled brown stone, likely jasper or fine-grained quartzite

Uncertain; probable microcrystalline quartz (SiO₂), possibly ferruginous jasper

AI-generated identification · may be incorrect

Smoothly polished, opaque brown material with subtle speckling and tiny dark inclusions; likely Mohs 6.5–7, vitreous-to-dull luster, massive texture, no visible cleavage, and specific gravity around 2.6. The photograph alone cannot distinguish jasper from quartzite or another hard silicate pebble.

Identified August 21, 2026More sedimentary or metamorphic →

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At a glance

Common name: Tumbled brown stone, likely jasper or fine-grained quartzite
Scientific name: Uncertain; probable microcrystalline quartz (SiO₂), possibly ferruginous jasper
Category: sedimentary or metamorphic
Identified: August 21, 2026
Method: Standard

AI Estimated Value

$1–$10 for a common tumbled specimen; up to $15–$30 if unusually attractive, large, or confidently identified.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

If jasper, it formed from silica-rich fluids replacing or cementing sediment; if quartzite, it formed by metamorphism of quartz sandstone. The source rock could range from Precambrian to much younger, while tumbling is human processing.

Uses & applications

Used as a decorative tumbled stone, paperweight, craft material, or low-cost cabochon; generally not suitable for major construction because of its small size.

Geological facts

The rounded shape and uniformly polished surface indicate a commercial tumbler rather than natural weathering. Brown coloration commonly comes from iron oxides or hydroxides.

Field identification & locations

Check hardness with a steel nail or glass, streak (usually white), and acid reaction (none); a 10× loupe may reveal quartz grains or jasper-like cryptocrystalline texture. Common sources include gravel deposits and jasper/quartzite regions worldwide.