sedimentary

Weathered sandstone or arkosic conglomeratic sandstone

Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by silica, calcite, or iron oxides

AI-generated identification · may be incorrect

Hardness approximately 6–7 for quartz grains but variable overall; tan, brown, and gray, with a rough granular texture and dull to earthy luster. Visible grains and rusty yellow-brown iron-oxide staining suggest sandstone, possibly containing pebbly clasts.

Identified September 20, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or arkosic conglomeratic sandstone
Scientific name: Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by silica, calcite, or iron oxides
Category: sedimentary
Identified: September 20, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 for a common hand specimen; little commercial value unless unusually colorful, fossiliferous, or from a notable 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

Formed when sand and gravel accumulated, were compacted, and cemented in a river, alluvial, or shoreline environment; its exact geological age cannot be determined from the image.

Uses & applications

Used as building or paving stone, aggregate, and ornamental material when sound; this irregular specimen is mainly suitable for collecting or educational use.

Geological facts

The rusty coloration commonly results from oxidation of iron-bearing minerals, while lighter grains are likely quartz and feldspar.

Field identification & locations

Identify it by its gritty surface, visible rounded grains or small clasts, and tendency to shed sand; acid testing can reveal calcite cement, and a hand lens helps distinguish sandstone from conglomerate. Common worldwide in sedimentary basins.