mineral

Tumbled brown stone, possibly jasper or iron-rich quartz

Uncertain; likely microcrystalline quartz (SiO₂) with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque to weakly translucent brown, with a dull to slightly waxy luster and irregular mottling; likely hardness about 6.5–7 Mohs, lacking visible cleavage. The small rounded shape indicates tumbling or natural abrasion.

Identified August 23, 2026More mineral →

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At a glance

Common name: Tumbled brown stone, possibly jasper or iron-rich quartz
Scientific name: Uncertain; likely microcrystalline quartz (SiO₂) with iron-oxide inclusions
Category: mineral
Identified: August 23, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 for a small common tumbled specimen; unusual patterning or confirmed locality may raise value to roughly $10–$30.

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 when silica-rich fluids replaced or cemented volcanic or sedimentary material, with iron oxides producing the brown color; its exact geological age and locality cannot be determined from the image.

Uses & applications

Used as a decorative stone, cabochon, bead, or inexpensive lapidary material; it has little industrial value in this small form.

Geological facts

The appearance is consistent with common brown jasper, iron-stained chalcedony, or another quartz-rich pebble, but a firm identification requires a sharper image and tests such as streak, hardness, and specific gravity.

Field identification & locations

Commonly found in river gravels and volcanic or sedimentary terrains worldwide. A quartz-rich specimen resists scratching by a steel knife, while jasper leaves a white streak and shows no fizz with dilute acid.