sedimentary

Weathered sandstone or iron-stained sedimentary pebble

Quartz-rich sandstone; primarily SiO₂ with iron-oxide staining

AI-generated identification · may be incorrect

Fine-grained, dull earthy luster, tan-brown color, and an irregular fracture; likely Mohs hardness about 5–7 depending on cement, with no obvious cleavage. The rounded shape suggests natural water abrasion or tumbling.

Identified August 28, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or iron-stained sedimentary pebble
Scientific name: Quartz-rich sandstone; primarily SiO₂ with iron-oxide staining
Category: sedimentary
Identified: August 28, 2026
Method: Standard

AI Estimated Value

Typically $0–$5 as an ordinary pebble; up to about $10–$20 if unusually attractive, provenance-linked, or collected as part of a labeled geological set.

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 lithified sand cemented by silica, calcite, or iron oxides, then weathered and rounded in a stream, beach, or gravel deposit. Its exact geological age cannot be determined from the photograph.

Uses & applications

Generally a common field stone with little commercial value; may be used as landscaping gravel, decorative stone, or a teaching specimen.

Geological facts

The dark brown coloration is consistent with hematite or goethite staining, while the visible crack may be a natural fracture or impact damage.

Field identification & locations

Likely locations include streambeds, beaches, and sedimentary outcrops worldwide. Look for gritty texture, sand-sized grains, layering, and a streak or fresh broken surface; acid testing can distinguish carbonate cement from silica cement.