sedimentary

Polished or naturally smoothed jasper/chalcedony pebble

Microcrystalline quartz (SiO₂), likely iron-stained jasper with chalcedony

AI-generated identification · may be incorrect

Opaque cream, orange, yellow, and dark green-black mottling; waxy to slightly vitreous luster and no visible cleavage. Quartz hardness is about 6.5–7 Mohs, with a fine-grained cryptocrystalline structure; the dark areas may include iron or manganese oxides and other inclusions.

Identified September 17, 2026More sedimentary →

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At a glance

Common name: Polished or naturally smoothed jasper/chalcedony pebble
Scientific name: Microcrystalline quartz (SiO₂), likely iron-stained jasper with chalcedony
Category: sedimentary
Identified: September 17, 2026
Method: Standard

AI Estimated Value

About $3–$15 for a small common pebble; $20–$75 if unusually patterned, polished, or confirmed from a desirable 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 groundwater filled cavities or replaced material in volcanic or sedimentary rocks, with iron and other impurities creating the colors. Exact geological age and locality cannot be determined from the image.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, and decorative objects; attractive patterned pieces have modest jewelry and collecting value.

Geological facts

The orange-red coloration commonly reflects hematite or limonite, while green-black patches may represent chlorite, epidote, manganese oxides, or matrix minerals. A glassy scratch test can help distinguish quartz-rich jasper from softer decorative stone.

Field identification & locations

Commonly found in silica-rich volcanic terrains, river gravels, and agate/jasper deposits worldwide. Identify by its opaque fine texture, strong hardness, waxy luster, and resistance to scratching by a steel knife.