mineral

Tumbled brown jasper (probable picture jasper or brecciated jasper)

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

AI-generated identification · may be incorrect

Opaque, rounded and polished; dark brown to olive-brown with cream mottling, vitreous-to-waxy luster, and no visible cleavage. Mohs hardness 6.5–7; specific gravity about 2.6.

Identified September 16, 2026More mineral →

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At a glance

Common name: Tumbled brown jasper (probable picture jasper or brecciated jasper)
Scientific name: Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions
Category: mineral
Identified: September 16, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small ordinary tumbled stone; $20–$75 for unusually patterned, larger, or locality-labeled material.

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

Opaque, rounded and polished; dark brown to olive-brown with cream mottling, vitreous-to-waxy luster, and no visible cleavage. Mohs hardness 6.5–7; specific gravity about 2.6.

Formation & geological history

Forms when silica-rich groundwater fills cavities or replaces volcanic and sedimentary material, with iron oxides producing the brown coloration. Deposits are generally Precambrian to Cenozoic in age, depending on locality.

Uses & applications

Used for cabochons, beads, carvings, tumbling stones, ornaments, and small decorative objects; it has little industrial value compared with quartz aggregate.

Geological facts

Jasper is an opaque variety of chalcedony distinguished from agate by its lack of translucency. Patterns and colors vary widely because of included hematite, goethite, clay, or volcanic material.

Field identification & locations

Identify it by its opaque appearance, fine-grained texture, hardness, and inability to scratch with a steel knife; quartz or feldspar glass should not scratch it. Common sources include the western United States, Madagascar, Brazil, India, and Australia.