gemstone

Polished jasper/chalcedony pebble

Cryptocrystalline silica, mainly SiO₂; likely brecciated or orbicular jasper with chalcedony

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque cream, gray, brown, and rusty-orange patterning with a glossy polish and waxy-to-glassy luster. Microcrystalline quartz has no visible cleavage and conchoidal fracture; density is approximately 2.6 g/cm³.

Identified September 15, 2026More gemstone →

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At a glance

Common name: Polished jasper/chalcedony pebble
Scientific name: Cryptocrystalline silica, mainly SiO₂; likely brecciated or orbicular jasper with chalcedony
Category: gemstone
Identified: September 15, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small polished common pebble; roughly $30–$100+ for unusually vivid patterning, provenance, or fine lapidary quality.

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 groundwater fills cavities or replaces volcanic and sedimentary material, producing colored jasper and translucent chalcedony; the exact geological age and locality cannot be determined from the image. It was later naturally rounded and human-polished.

Uses & applications

Used for cabochons, beads, carvings, worry stones, and ornamental objects; it has little industrial value compared with bulk silica. Attractive patterning increases lapidary and collector appeal.

Geological facts

The dark patches may reflect iron/manganese oxides or included volcanic material, while orange areas commonly indicate iron staining. “Jasper” is a trade term for opaque, impure microcrystalline quartz rather than a single mineral species.

Field identification & locations

Identify it by its very hard, non-cleaving surface, opaque patterned body, and inability to scratch with a steel knife; it should scratch ordinary glass. Common sources include volcanic terrains in Oregon, Idaho, Madagascar, Australia, India, and Brazil, but locality cannot be confirmed here.