sedimentary

Small rounded pebble, likely weathered sandstone or iron-stained sedimentary rock

Indeterminate; probable quartz-rich sandstone (SiO₂ with clay/iron-oxide cement)

AI-generated identification · may be incorrect

Brown-gray, dull to weakly earthy luster, fine-grained and rounded; likely Mohs hardness 5–7 depending on cement. No visible crystals or cleavage; exact identification requires a close, sharp image and simple tests.

Identified August 20, 2026More sedimentary →

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At a glance

Common name: Small rounded pebble, likely weathered sandstone or iron-stained sedimentary rock
Scientific name: Indeterminate; probable quartz-rich sandstone (SiO₂ with clay/iron-oxide cement)
Category: sedimentary
Identified: August 20, 2026
Method: Standard

AI Estimated Value

Typically under $1 as an ordinary pebble; perhaps $1–$5 if it proves distinctive or comes from 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

Likely formed from compacted sand and later cementation, then rounded by water or abrasion; age and formation environment cannot be determined visually. Iron oxides commonly produce the brown coloration.

Uses & applications

As shown, it has little commercial or collector value; comparable sandstone is used for building stone, paving, aggregate, and landscaping.

Geological facts

The small, worn shape indicates transport or handling, but appearance alone cannot distinguish sandstone from a weathered basalt, mudstone, or artificial aggregate.

Field identification & locations

Check texture with magnification, streak on unglazed ceramic, hardness against a steel nail, and reaction to dilute hydrochloric acid; sandstone feels gritty, while basalt is typically denser and darker. Commonly found in stream beds, gravel deposits, and landscaping material.