mineral

Tumbled jasper (likely brecciated or iron-rich jasper)

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

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, reddish-brown, and dark gray with a smooth tumbled surface and waxy to dull luster. It has cryptocrystalline quartz structure, no visible cleavage, and typical specific gravity near 2.6.

Identified September 3, 2026More mineral →

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At a glance

Common name: Tumbled jasper (likely brecciated or iron-rich jasper)
Scientific name: Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides and possibly other silicates
Category: mineral
Identified: September 3, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small common tumbled stone; $20–$75 or more for unusually patterned, larger, or well-polished specimens.

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 volcanic, sedimentary, or hydrothermal material, with iron producing the brown-red coloration; ages vary widely, commonly Precambrian to younger. This specimen has been human-polished.

Uses & applications

Used for cabochons, beads, carvings, worry stones, and ornamental objects; it is inexpensive but attractive as a lapidary material.

Geological facts

Jasper is a variety of opaque chalcedony and can show brecciation, banding, orbicular patterns, or dendritic markings. Exact identification requires a fresh surface or laboratory testing because many brown stones look similar.

Field identification & locations

Identify it by its opaque appearance, fine texture, glassy/waxy polish, and resistance to scratching with a steel knife; quartz should scratch glass. Common sources include the western United States, Madagascar, Brazil, India, and Australia.