sedimentary

Weathered sandstone or siltstone pebble

Indeterminate siliciclastic sedimentary rock, likely quartz-rich sandstone (SiO₂-dominated)

AI-generated identification · may be incorrect

Pale tan-gray, fine-grained, dull to earthy luster, rounded and heavily weathered. Hardness likely about 5–7 Mohs depending on cement; no obvious cleavage or crystal faces are visible.

Identified September 14, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or siltstone pebble
Scientific name: Indeterminate siliciclastic sedimentary rock, likely quartz-rich sandstone (SiO₂-dominated)
Category: sedimentary
Identified: September 14, 2026
Method: Standard

AI Estimated Value

Typically $0–$5 as an ordinary field pebble; possibly $5–$20 if it displays unusual texture, fossil impressions, or provenance.

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

Pale tan-gray, fine-grained, dull to earthy luster, rounded and heavily weathered. Hardness likely about 5–7 Mohs depending on cement; no obvious cleavage or crystal faces are visible.

Formation & geological history

Formed from compacted and cemented sand or silt, then rounded by transport and weathering. The photograph cannot establish its geological age; sandstones of many ages occur in the Ouachita–Arkansas/Oklahoma region near the reported location.

Uses & applications

Commonly used as aggregate, building stone, paving material, and decorative rock; this ordinary rounded specimen has little commercial value.

Geological facts

The mottled brown-gray patches may be iron-oxide staining or weathering, not necessarily fossils. A close image cannot reliably distinguish sandstone from fine-grained siltstone or weathered quartzite.

Field identification & locations

The reported region contains abundant sedimentary rocks, making this identification geographically plausible. Test a fresh edge: quartz-rich sandstone scratches glass and resists a steel nail; dilute hydrochloric acid indicates carbonate cement if it fizzes. A hand lens should reveal sand grains.