sedimentary

Weathered sandstone or iron-rich siltstone

Clastic sedimentary rock, likely quartz-rich sandstone (SiO₂-dominated) with iron-oxide cement

AI-generated identification · may be incorrect

Tan-brown, dull to earthy luster, fine to medium granular texture, and weakly layered surface; estimated Mohs hardness 5–7, with no obvious cleavage and variable porosity. Iron staining likely causes the brown coloration.

Identified August 24, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or iron-rich siltstone
Scientific name: Clastic sedimentary rock, likely quartz-rich sandstone (SiO₂-dominated) with iron-oxide cement
Category: sedimentary
Identified: August 24, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an unidentified hand specimen; more if provenance, unusual texture, or collectible mineralization is documented.

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 by deposition, compaction, and cementation of sand or silt, probably in a river, floodplain, dune, or shallow marine setting. Its exact geological age cannot be determined from the photograph.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and occasionally carving; this small specimen has mainly educational or decorative value.

Geological facts

The block appears strongly weathered and may also be ferruginous sandstone or compact siltstone. A hand lens and fresh broken surface would help distinguish grain size and cement.

Field identification & locations

Look for visible quartz grains, bedding, gritty texture, and scratching by glass or steel; dilute acid should generally produce little or no fizz. Common worldwide, especially in sedimentary basins.