gemstone

Polished brown jasper (likely brecciated or orbicular jasper)

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

AI-generated identification · may be incorrect

Typically Mohs 6.5–7; opaque brown, black, cream, and rusty-gold patterning with a glassy-to-waxy polish. It has no visible cleavage and is composed of cryptocrystalline quartz; specific gravity is about 2.6.

Identified August 10, 2026More gemstone →

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At a glance

Common name: Polished brown jasper (likely brecciated or orbicular jasper)
Scientific name: Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions
Category: gemstone
Identified: August 10, 2026
Method: Standard

AI Estimated Value

About $10–$40 for a palm-sized polished piece; $50–$150+ for unusually attractive patterning, size, or provenance.

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 groundwater replaces or cements volcanic ash, sediments, or breccia, commonly with iron-oxide staining. Its exact geological age depends on the deposit, ranging from Precambrian to much younger volcanic or sedimentary settings.

Uses & applications

Used for cabochons, beads, carvings, palm stones, and ornamental objects; polished material is generally decorative rather than industrial.

Geological facts

The specimen’s strongly layered, flowing pattern could also represent polished ribbon jasper or a jasper-rich breccia; a definitive identification requires testing or an unpolished surface.

Field identification & locations

Identify by its opaque body, fine texture, hardness, and inability to scratch with a steel knife easily; common sources include India, Madagascar, Brazil, Mexico, and the western United States. Avoid confusing it with dyed agate or man-made glass.