sedimentary

Brecciated jasper (polychrome jasper)

Silicified breccia composed mainly of microcrystalline quartz (SiO₂), with iron-oxide and clay/mineral impurities

AI-generated identification · may be incorrect

Typically Mohs 6.5–7; opaque, multicolored red, brown, tan, gray, and green; dull to waxy or glassy luster when polished. Massive, non-cleavable, with irregular fracture and specific gravity around 2.5–2.7.

Identified September 17, 2026More sedimentary →

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At a glance

Common name: Brecciated jasper (polychrome jasper)
Scientific name: Silicified breccia composed mainly of microcrystalline quartz (SiO₂), with iron-oxide and clay/mineral impurities
Category: sedimentary
Identified: September 17, 2026
Method: Standard

AI Estimated Value

About $10–$50 for ordinary rough pieces; $50–$200+ for large, vividly patterned 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

Forms when silica-rich fluids cement angular rock fragments, commonly replacing volcanic or sedimentary material; iron oxides create the red-brown colors. Exact age is locality-dependent, ranging from Paleozoic to Cenozoic deposits.

Uses & applications

Used as ornamental stone, cabochons, beads, carvings, polished slabs, and lapidary display pieces; rarely used for small architectural accents.

Geological facts

The angular clasts and contrasting cement are diagnostic of brecciation, while the vivid coloration reflects hematite, goethite, chlorite, or related minerals.

Field identification & locations

Identify by testing for quartz-like hardness, opaque patterned fragments, lack of cleavage, and resistance to scratching by steel; common examples occur in volcanic terrains of Madagascar, Oregon, Utah, Mexico, and Australia.