mineral

Tumbled brown jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Opaque brown to reddish-brown, mottled and faintly brecciated, with a vitreous-to-waxy luster and no visible cleavage. Hardness is approximately 6.5–7 Mohs; density about 2.6 g/cm³. The rounded, glossy surface indicates tumbling or polishing.

Identified September 14, 2026More mineral →

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At a glance

Common name: Tumbled brown jasper (likely brecciated jasper)
Scientific name: Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions
Category: mineral
Identified: September 14, 2026
Method: Standard

AI Estimated Value

Approximately $2–$15 for a small common tumbled stone; higher-quality patterned cabochons or polished pieces 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

Forms when silica-rich fluids cement and replace fine-grained sediments or fractured volcanic material, with iron oxides producing the brown-red coloration. Jasper deposits commonly formed from Paleozoic to Cenozoic volcanic or sedimentary systems.

Uses & applications

Used for cabochons, beads, carvings, decorative stones, and lapidary collections; occasionally used as architectural or ornamental material.

Geological facts

Jasper is a variety of opaque chalcedony and may contain hematite, goethite, clay minerals, or remnants of volcanic rock. The precise variety cannot be confirmed from the photograph alone.

Field identification & locations

Identify by its opaque earthy colors, very fine texture, quartz-like hardness, and absence of cleavage; it should scratch glass but not be scratched by a steel knife. Common sources include India, Madagascar, Brazil, Mexico, Australia, and the western United States.