sedimentary

Likely weathered sandstone or iron-stained limestone pebble

Indeterminate clastic carbonate/siliciclastic rock; mineral composition likely quartz, feldspar, and/or calcite with iron oxides

AI-generated identification · may be incorrect

Tan-orange, rounded, fine-grained and dull to slightly earthy; estimated Mohs hardness 3–7 depending on calcite versus quartz content, with no visible cleavage or crystals. The porous, speckled surface suggests a naturally weathered sedimentary pebble.

Identified August 17, 2026More sedimentary →

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At a glance

Common name: Likely weathered sandstone or iron-stained limestone pebble
Scientific name: Indeterminate clastic carbonate/siliciclastic rock; mineral composition likely quartz, feldspar, and/or calcite with iron oxides
Category: sedimentary
Identified: August 17, 2026
Method: Standard

AI Estimated Value

Typically $0–$5 for an ordinary pebble; up to about $10–$20 if locally significant or unusually attractive.

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

Formed from cemented sedimentary grains or carbonate mud, then rounded by stream, beach, or glacial transport; the exact geological age cannot be determined from the photograph.

Uses & applications

Commonly used as landscaping gravel, aggregate, or a teaching/collecting specimen; this ordinary pebble has little jewelry value.

Geological facts

Iron-oxide staining produces the orange coloration. A drop of dilute hydrochloric acid would fizz if calcite-rich limestone, while sandstone generally will not.

Field identification & locations

Common in sedimentary terrains and river or beach deposits worldwide; inspect grain texture and test a concealed spot for acid reaction. The image alone cannot reliably distinguish sandstone from limestone.