gemstone

Polished brecciated jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and possibly manganese-oxide inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, black, mustard-yellow, and orange coloration with a glassy to waxy polish. It has cryptocrystalline quartz structure, no visible cleavage, conchoidal fracture, and typically specific gravity around 2.6.

Identified September 12, 2026More gemstone →

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At a glance

Common name: Polished brecciated jasper
Scientific name: Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and possibly manganese-oxide inclusions
Category: gemstone
Identified: September 12, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a palm-sized polished common specimen; unusually attractive patterning or fine workmanship may raise value to $50–$100.

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

Formed when silica-rich fluids replaced or cemented volcanic or sedimentary material, while iron and manganese oxides produced the dark and ochre patterns; the exact geological age cannot be determined from the image. Commonly occurs in weathered volcanic terrains and hydrothermal cavities.

Uses & applications

Used as a lapidary stone for cabochons, tumbled stones, carvings, beads, and decorative objects; it is not generally used as a structural construction stone.

Geological facts

The specimen appears polished and possibly naturally brecciated, with vein-like fractures and oxidation bands. Patterned jasper is valued mainly for visual quality rather than rarity.

Field identification & locations

Identify it by its opaque multicolor pattern, quartz-like hardness, lack of cleavage, and inability to scratch with a steel nail; acid produces no reaction. Common sources include India, Madagascar, Indonesia, Mexico, and the western United States.