mineral

Polished jasper (likely brecciated or orbicular jasper)

Jasper, microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; opaque, dark brown to black with rusty-orange and cream patches; typically vitreous to waxy luster, cryptocrystalline structure, no cleavage, and specific gravity about 2.5–2.7.

Identified September 3, 2026More mineral →

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At a glance

Common name: Polished jasper (likely brecciated or orbicular jasper)
Scientific name: Jasper, microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions
Category: mineral
Identified: September 3, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a small polished stone; $30–$100+ for unusually attractive patterning, size, or documented 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

Forms when silica-rich fluids cement or replace volcanic ash, sediments, or breccia, with iron oxides producing brown-red colors. Deposits are generally Paleozoic to Cenozoic, though age varies by locality.

Uses & applications

Used for cabochons, beads, carvings, worry stones, and lapidary collectibles; occasionally used decoratively as dimension stone.

Geological facts

The contrasting patches reflect variations in chalcedony, quartz, iron oxides, and altered host material. Its polish and opacity distinguish it from transparent quartz varieties.

Field identification & locations

Identify by its very fine texture, opaque patterned body, glassy-to-waxy polish, and ability to scratch glass; common sources include Oregon, Idaho, California, Madagascar, Brazil, and Australia. Exact variety requires locality or testing.