mineral

Polished brown jasper pebble

Jasper, an opaque microcrystalline variety of chalcedony (SiO₂), commonly containing iron oxides and other impurities

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; mustard-brown to olive-brown, opaque, with a glassy-to-waxy polish. It has cryptocrystalline quartz structure, no visible cleavage, and specific gravity near 2.6; the wet appearance is enhanced by surface coating or water.

Identified August 26, 2026More mineral →

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At a glance

Common name: Polished brown jasper pebble
Scientific name: Jasper, an opaque microcrystalline variety of chalcedony (SiO₂), commonly containing iron oxides and other impurities
Category: mineral
Identified: August 26, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a common polished pebble; $20–$100+ for unusually patterned, large, or locality-documented material.

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 ash, sediments, or other rocks, with iron producing the brown coloration; deposits range from Precambrian to younger geological ages. Common sources include volcanic terrains and sedimentary silica deposits worldwide.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and lapidary collectibles; occasionally used decoratively in inlay and small ornamental objects.

Geological facts

Jasper is an aggregate rather than a single pure crystal, so patterns and colors vary widely. Brown varieties may be sold as picture jasper, mookaite, or simply brown jasper, but exact naming requires geological locality information.

Field identification & locations

Identify it by its opacity, fine-grained texture, lack of cleavage, and ability to scratch glass; it should not fizz in dilute hydrochloric acid. Common localities include the United States, Mexico, Australia, India, Brazil, and Madagascar.