mineral

Polished brown jasper (likely ocean or brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides

AI-generated identification · may be incorrect

Opaque brown, golden, and reddish surface with darker veining and irregular cavities; typically waxy to glossy luster and no visible cleavage. Hardness is about 6.5–7 Mohs; specific gravity approximately 2.55–2.70; composition is cryptocrystalline quartz.

Identified August 10, 2026More mineral →

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At a glance

Common name: Polished brown jasper (likely ocean or brecciated jasper)
Scientific name: Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides
Category: mineral
Identified: August 10, 2026
Method: Standard

AI Estimated Value

About $10–$60 for a hand-sized polished specimen; unusual patterns, provenance, or exceptional lapidary quality may bring $100–$300.

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 fill cavities or replace volcanic and sedimentary material, with iron staining producing the brown coloration; commonly Cenozoic to older, depending on locality. The specimen appears shaped and highly polished, so its natural texture is partly obscured.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and lapidary display; occasionally used as decorative stone. Common polished pieces generally have modest commercial value.

Geological facts

Jasper is a variety of opaque chalcedony rather than a single mineral species. Color patterns may resemble breccia, landscape, or ocean jasper depending on the exact locality.

Field identification & locations

Identify by its opaque silica-rich body, glassy/waxy polish, lack of cleavage, and ability to resist scratching by steel; a streak test and hardness test can help distinguish it from resin or glass. Common sources include Madagascar, Indonesia, Brazil, Australia, Mexico, and the western United States.