gemstone

Tumbled dark red-brown stone, possibly jasper

Likely opaque microcrystalline quartz (chalcedony/jasper), SiO₂; exact identification is uncertain from the blurred photograph

AI-generated identification · may be incorrect

Smooth, rounded, tumbled surface with dark reddish-brown and black mottling, opaque appearance, and dull to waxy luster. Estimated hardness 6.5–7 Mohs; no visible cleavage; specific gravity about 2.6.

Identified August 10, 2026More gemstone →

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At a glance

Common name: Tumbled dark red-brown stone, possibly jasper
Scientific name: Likely opaque microcrystalline quartz (chalcedony/jasper), SiO₂; exact identification is uncertain from the blurred photograph
Category: gemstone
Identified: August 10, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common tumbled piece; $10–$50 if unusually patterned, large, or sold as a quality cabochon.

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

Jasper forms when silica-rich fluids replace or cement sedimentary or volcanic material, commonly with iron oxides producing red-brown colors. The specimen was mechanically shaped and polished; its geological age cannot be determined visually.

Uses & applications

Used for cabochons, beads, carvings, tumbling, and decorative objects; durable enough for minor ornamental applications but generally not major construction use.

Geological facts

Iron oxide inclusions commonly create red, brown, yellow, and black patterns in jasper. Similar-looking materials include mahogany obsidian, dyed agate, and iron-rich quartzite.

Field identification & locations

Test for a glassy scratch and inspect a freshly chipped area: jasper remains opaque and fine-grained, while glass shows conchoidal fracture and may contain bubbles. Common sources include India, Brazil, Madagascar, Uruguay, and the western United States.