mineral

Tumbled brown stone, likely jasper or iron-stained quartz

Microcrystalline quartz (SiO₂), possibly chalcedony/jasper with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque brown to golden-brown, dull to slightly waxy luster, rounded from tumbling or natural abrasion; quartz hardness is about 7 Mohs, with no obvious cleavage and conchoidal fracture. The small size and image lighting prevent confident distinction from brown chert or another common siliceous pebble.

Identified August 8, 2026More mineral →

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At a glance

Common name: Tumbled brown stone, likely jasper or iron-stained quartz
Scientific name: Microcrystalline quartz (SiO₂), possibly chalcedony/jasper with iron-oxide inclusions
Category: mineral
Identified: August 8, 2026
Method: Standard

AI Estimated Value

$1-$5 for a small common tumbled pebble; approximately $5-$20 if it has unusually attractive patterning or confirmed lapidary quality.

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

Likely formed when silica-rich groundwater deposited cryptocrystalline quartz, later colored by hematite or limonite; such material can range from ancient sedimentary deposits to younger weathering gravels. The specimen appears polished or naturally water-worn rather than freshly broken.

Uses & applications

Used as inexpensive decorative stone, cabochons, beads, tumbled stones, and lapidary material; ordinary pieces have little industrial or jewelry value.

Geological facts

Jasper and chert are varieties of opaque chalcedony, while iron oxides produce the yellow, red, and brown coloration. A steel file generally will not scratch quartz, but glass can be scratched by it.

Field identification & locations

Common in river gravels and silica-rich volcanic or sedimentary terrains worldwide, including the western United States, Brazil, India, and Australia. Confirm with a hardness test, streak (usually white), and close inspection for cryptocrystalline texture.