sedimentary

Rounded reddish-brown pebble

Likely ferruginous sandstone or iron-rich quartzite; exact identification requires a fresh surface and tests

AI-generated identification · may be incorrect

Fine-grained, matte to weakly earthy luster, reddish-brown from iron oxides, and smoothly water-rounded; likely hardness about 5–7 Mohs with no visible cleavage. The uniform texture suggests sandstone or quartzite rather than a crystal-rich igneous rock.

Identified August 11, 2026More sedimentary →

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At a glance

Common name: Rounded reddish-brown pebble
Scientific name: Likely ferruginous sandstone or iron-rich quartzite; exact identification requires a fresh surface and tests
Category: sedimentary
Identified: August 11, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as a casual specimen or décor stone; distinctive, polished, or locality-labeled pieces may sell for about $10–$30.

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 formed from quartz-rich sediment cemented into sandstone, possibly metamorphosed into quartzite, then weathered and rounded in a river, beach, or glacial setting. Its geological age cannot be determined from the photograph.

Uses & applications

Common material has little industrial or jewelry value, though attractive pebbles may be used in landscaping, décor, lapidary work, or educational collections.

Geological facts

Iron minerals such as hematite and goethite commonly produce red, brown, or purple coloration. The broad, smooth shape indicates prolonged abrasion during transport.

Field identification & locations

Check for gritty grains and fizz-free behavior: sandstone feels slightly sandy, while quartzite is exceptionally hard and rings when tapped. A steel file or glass-scratch test, streak test, and fresh broken surface would distinguish it more reliably; common worldwide.