gemstone

Polished brecciated jasper (likely ocean jasper or brecciated agate)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions and possible chalcedony

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; brown, reddish, cream, and gray colors with mottled/brecciated pattern; waxy to vitreous luster; cryptocrystalline structure; no visible cleavage; specific gravity about 2.6.

Identified August 30, 2026More gemstone →

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At a glance

Common name: Polished brecciated jasper (likely ocean jasper or brecciated agate)
Scientific name: Microcrystalline quartz, SiO₂, with iron-oxide inclusions and possible chalcedony
Category: gemstone
Identified: August 30, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small common polished piece; $30–$100+ if the pattern, polish, or verified locality is exceptional.

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 replace or cement volcanic or sedimentary material, with iron oxides producing the brown-red coloration. Most jasper formed in ancient volcanic and sedimentary environments, commonly Precambrian to Mesozoic in age.

Uses & applications

Used for cabochons, tumbled stones, carvings, beads, and decorative objects; historically also used for tools and ornaments.

Geological facts

The specimen appears wet or highly polished, which intensifies its colors and luster. Exact identification as ocean jasper versus brecciated jasper requires the locality and examination of pattern, translucency, and texture.

Field identification & locations

Identify by its opaque-to-slightly translucent quartz-like body, hardness, lack of cleavage, and resistance to scratching by steel. Common sources include Madagascar, Australia, Brazil, India, and the western United States.