mineral

Polished jasper pebble, likely ocean or brecciated jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides and other impurities

AI-generated identification · may be incorrect

Opaque, rounded and polished; mottled olive-green, red, brown, gray, and yellow coloration with dull to waxy luster. Mohs hardness about 6.5–7; cryptocrystalline quartz, with no visible cleavage and specific gravity near 2.6.

Identified September 18, 2026More mineral →

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At a glance

Common name: Polished jasper pebble, likely ocean or brecciated jasper
Scientific name: Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides and other impurities
Category: mineral
Identified: September 18, 2026
Method: Standard

AI Estimated Value

About $3–$20 for a common polished pebble; $20–$100+ for larger pieces with exceptional patterning or a documented 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

Formed when silica-rich fluids filled cavities or cemented brecciated volcanic or sedimentary material, with iron oxides producing the red, yellow, and brown colors. The pebble was later naturally rounded and/or human polished; its precise geological age cannot be determined from the image.

Uses & applications

Used for cabochons, beads, carvings, tumbling, ornamental objects, and collectible lapidary specimens; rarely used as a minor decorative stone in construction.

Geological facts

Jasper is an opaque variety of chalcedony rather than a single mineral species; patterns and colors vary greatly, making locality identification difficult from appearance alone.

Field identification & locations

Identify it by its opaque appearance, hardness, waxy luster, and resistance to scratching by a steel blade; it should not show the glassy transparency typical of many agates. Common sources include volcanic terrains worldwide, especially India, Madagascar, Brazil, Australia, and the western United States.