sedimentary

Rounded quartz-rich river pebble

Likely quartz arenite or chert-derived sandstone; identification is limited from the photograph

AI-generated identification · may be incorrect

Pale tan-gray, fine-grained, dull to weakly silky luster, and smoothly water-worn; likely hardness about 6–7 if quartz-rich, with no visible cleavage. Dense and compact, but grain texture is not resolvable.

Identified September 15, 2026More sedimentary →

Explore Rounded quartz-rich river pebble in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Rounded quartz-rich river pebble
Scientific name: Likely quartz arenite or chert-derived sandstone; identification is limited from the photograph
Category: sedimentary
Identified: September 15, 2026
Method: Standard

AI Estimated Value

Usually $0–$5 as an ordinary pebble; approximately $5–$20 if unusually attractive, polished, or confirmed as collectible jasper/chert.

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

Probably a weathered and stream-rounded sedimentary fragment, formed from cemented sand or silica-rich microcrystalline material; its depositional age cannot be determined visually. Subsequent erosion produced the rounded shape.

Uses & applications

Generally used as a decorative pebble, paperweight, or landscaping stone; it has little jewelry or industrial value unless it proves to be attractive chert, jasper, or another distinctive material.

Geological facts

The specimen may also be a fine-grained quartzite or weathered limestone, since color and texture overlap in a single image. A streak, hardness, acid, and grain test would improve identification.

Field identification & locations

Common in river gravels, beaches, glacial deposits, and weathered sedimentary terrains. Scratch testing with steel or glass, checking for visible grains, and applying dilute hydrochloric acid can distinguish quartz-rich rock from calcite-bearing limestone.