mineral

Polished brecciated jasper (likely mushroom or mookaite-type jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide staining and breccia-like patterns

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque cream, tan, brown, and reddish coloring; vitreous to waxy polished luster; cryptocrystalline quartz with no visible cleavage and conchoidal fracture. The rounded form indicates tumbling or polishing.

Identified August 30, 2026More mineral →

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At a glance

Common name: Polished brecciated jasper (likely mushroom or mookaite-type jasper)
Scientific name: Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide staining and breccia-like patterns
Category: mineral
Identified: August 30, 2026
Method: Standard

AI Estimated Value

Approximately $3–$20 for a common tumbled piece; $20–$75 or more for unusually attractive patterns, larger size, or confirmed locality.

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

Silica-rich groundwater replaced or cemented volcanic, sedimentary, or brecciated material, with iron oxides producing the brown-red colors. Comparable jaspers commonly formed in the Precambrian to Mesozoic eras, depending on locality.

Uses & applications

Used as a lapidary stone for cabochons, beads, carvings, and specimens; valued primarily for pattern and polish rather than rarity.

Geological facts

The dark branching lines may be iron-oxide-filled fractures or dendritic inclusions, not true crystal veins. Exact identification and locality usually require hardness, streak, translucency, and specific-gravity testing.

Field identification & locations

Common sources include Australia, Madagascar, India, Brazil, and the western United States. Field clues are a quartz-like hardness, opaque patterned body, lack of cleavage, and resistance to scratching by steel; the image alone cannot distinguish jasper varieties confidently.