metamorphic

Polished pietersite-like brecciated jasper

Silicified chalcedony/jasper aggregate, primarily SiO₂; exact material uncertain from image

AI-generated identification · may be incorrect

Hardness about 6.5–7, opaque purple-brown matrix with striking mustard-yellow to gold fibrous or vein-like patterns, and a vitreous to waxy luster. The irregular fractured piece appears polished or coated; patterns may represent iron-rich inclusions, quartz veins, or dyed material.

Identified September 19, 2026More metamorphic →

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At a glance

Common name: Polished pietersite-like brecciated jasper
Scientific name: Silicified chalcedony/jasper aggregate, primarily SiO₂; exact material uncertain from image
Category: metamorphic
Identified: September 19, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small undetermined specimen; $20–$100 if confirmed as attractive pietersite or quality patterned jasper.

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

Likely formed by silica-rich fluids replacing and cementing fractured volcanic or sedimentary material, with iron oxides producing the yellow-brown coloration; geological age depends on locality. The appearance is also consistent with a commercial composite or treated jasper rather than a single standard mineral species.

Uses & applications

Used as a lapidary and decorative stone for cabochons, carvings, beads, and specimens. Small pieces commonly have modest value unless the pattern is unusually attractive or the locality is documented.

Geological facts

Its highly graphic pattern resembles pietersite, brecciated jasper, and some treated “elephant skin” or iron-included chalcedony, but it lacks the chatoyant sheen typically diagnostic of true pietersite.

Field identification & locations

Check with a loupe for natural interlocking grains, test hardness against glass, and inspect for dye concentration in cracks or a surface coating; acid and streak tests are generally unhelpful. Similar jasper and chalcedony occur worldwide, notably in Brazil, India, Madagascar, and Africa.