sedimentary

Reddish-brown rock fragment, likely iron-oxide-stained sandstone

Probable quartz-rich sandstone (SiO₂ grains cemented by silica, iron oxides, or other minerals); exact identification is uncertain from the image

AI-generated identification · may be incorrect

Rough, granular surface with reddish-brown coloration, likely from iron-oxide staining; sandstone hardness varies, typically around 6–7 for quartz grains, and it has no consistent crystal cleavage. Luster appears dull; grain size and specific gravity cannot be determined reliably from the photo.

Identified October 10, 2026More sedimentary →

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At a glance

Common name: Reddish-brown rock fragment, likely iron-oxide-stained sandstone
Scientific name: Probable quartz-rich sandstone (SiO₂ grains cemented by silica, iron oxides, or other minerals); exact identification is uncertain from the image
Category: sedimentary
Identified: October 10, 2026
Method: Standard

AI Estimated Value

About $0–$5 for an ordinary loose fragment; more only if its provenance or features are notable.

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

Sandstone forms when deposited sand is compacted and cemented, across many geological ages and environments. The reddish tint commonly develops from iron oxides during or after formation.

Uses & applications

Sandstone is used as building and paving stone, dimension stone, and aggregate; this small fragment has mainly educational or collecting value.

Geological facts

The image does not provide enough detail to confirm sandstone or determine its age. A magnified view may reveal distinct sand-sized grains and cement.

Field identification & locations

Check whether grains are visible and gritty, and whether the piece scratches glass; these clues can support a quartz-rich sandstone identification. Sandstone occurs worldwide in sedimentary basins.