mineral

Polished brown jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides and other inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, tan, and cream with dark mottling; waxy to vitreous luster; cryptocrystalline structure and no visible cleavage. The smoothly tumbled, teardrop-shaped surface indicates human polishing.

Identified August 28, 2026More mineral →

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At a glance

Common name: Polished brown jasper (likely brecciated or orbicular jasper)
Scientific name: Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides and other inclusions
Category: mineral
Identified: August 28, 2026
Method: Standard

AI Estimated Value

About $3–$15 for a small common tumbled piece; $20–$75 or more for distinctive patterns, verified locality, or fine 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

Forms when silica-rich groundwater fills cavities or replaces volcanic and sedimentary material, with iron oxides creating brown-red coloration; jasper deposits range from Precambrian to Cenozoic in age. Common sources include India, Madagascar, Brazil, Indonesia, and the western United States.

Uses & applications

Used for cabochons, beads, carvings, worry stones, and decorative objects; occasionally used as ornamental stone. This small polished piece is primarily a lapidary or collector specimen.

Geological facts

Jasper is a dense, opaque variety of chalcedony rather than a single mineral species; patterns result from brecciation, flow textures, mineral replacement, or iron staining.

Field identification & locations

Identify by its opaque appearance, fine texture, glass-scratching hardness, and lack of cleavage; a steel knife should not easily scratch it. Exact locality and pattern determine the variety and value.