sedimentary

Rounded reddish pebble, likely iron-stained sandstone or weathered volcanic rock

Indeterminate; possibly ferruginous sandstone (quartz-rich) or weathered basalt

AI-generated identification · may be incorrect

Hardness approximately 5–7 depending on composition; dull to earthy reddish-brown surface, fine-grained, massive, and weakly porous. No visible crystals or cleavage; iron oxides likely cause the color.

Identified August 26, 2026More sedimentary →

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At a glance

Common name: Rounded reddish pebble, likely iron-stained sandstone or weathered volcanic rock
Scientific name: Indeterminate; possibly ferruginous sandstone (quartz-rich) or weathered basalt
Category: sedimentary
Identified: August 26, 2026
Method: Standard

AI Estimated Value

About $0–$5 as a common pebble; potentially $5–$20 if proven to be an unusual locality specimen.

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 weathering and erosion, followed by stream or beach abrasion that rounded the specimen; its geological age cannot be determined from the image. If sandstone, it is lithified sediment; if basalt, it formed from cooling lava.

Uses & applications

Typically used only as a decorative pebble, teaching specimen, or landscaping stone; not suitable for gemstone use without confirming composition.

Geological facts

The rounded shape indicates prolonged transport or abrasion. Small pits may reflect weathering, vesicles, or grains removed from a soft surface.

Field identification & locations

Test with a steel knife and glass: sandstone commonly scratches weakly and feels granular, while basalt is tougher and dense; dilute hydrochloric acid usually produces no reaction. Common in river gravels, beaches, and weathered outcrops worldwide.