mineral

Tumbled brown-and-cream stone, likely jasper or chert

Microcrystalline quartz (SiO₂), probably jasper/chert; exact identification requires testing

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, cream, and gray mottling with a smooth tumbled surface and dull to waxy luster. Quartz has a trigonal crystal structure, but the microscopic grains show no visible cleavage.

Identified September 7, 2026More mineral →

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At a glance

Common name: Tumbled brown-and-cream stone, likely jasper or chert
Scientific name: Microcrystalline quartz (SiO₂), probably jasper/chert; exact identification requires testing
Category: mineral
Identified: September 7, 2026
Method: Standard

AI Estimated Value

About $1–$10 as a small tumbled stone; higher-quality patterned cabochons or unusual jasper may sell for $10–$50.

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

Formed from silica-rich fluids or sediment that lithified and recrystallized into microcrystalline quartz, likely millions to hundreds of millions of years old; subsequently shaped by tumbling. Common sources include sedimentary terrains worldwide.

Uses & applications

Used as a lapidary stone for beads, cabochons, carvings, and decorative objects; less commonly used as crushed aggregate. Modest specimens are primarily collectible or ornamental.

Geological facts

Jasper is an opaque variety of chalcedony, while chert is typically silica-rich sedimentary rock; the boundary can be difficult to determine visually. The specimen’s rounded, polished form indicates human processing.

Field identification & locations

Identify with a scratch test: it should scratch ordinary glass but not be scratched by a steel knife; it should not fizz in dilute acid. Commonly sold as tumbled jasper, chert, or “picture jasper.”