sedimentary

Possible weathered sandstone or iron-rich sedimentary rock

Indeterminate; likely quartz-rich sandstone with iron-oxide cement

AI-generated identification · may be incorrect

Tan, dull to earthy luster, visibly granular and strongly weathered; likely Mohs 6–7 for quartz grains, with no obvious cleavage. The unusual curved shape appears natural erosion or human shaping, but the image alone cannot confirm mineral identity.

Identified August 13, 2026More sedimentary →

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At a glance

Common name: Possible weathered sandstone or iron-rich sedimentary rock
Scientific name: Indeterminate; likely quartz-rich sandstone with iron-oxide cement
Category: sedimentary
Identified: August 13, 2026
Method: Standard

AI Estimated Value

About $1–$10 as an unidentified common specimen; potentially $10–$30 if it proves unusual, fossiliferous, or historically significant.

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

Probably lithified sand cemented by silica, calcite, or iron oxides, then altered by weathering; age and exact formation environment are undetermined. It may also be a fragment of another porous sedimentary rock.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and decorative pieces; this specimen has no clear gem or industrial value without diagnostic testing.

Geological facts

Iron oxides commonly produce the yellow-brown to reddish coloration of weathered sandstone. A hand lens, streak test, acid test, and specific-gravity measurement would substantially improve identification.

Field identification & locations

Look for sand-sized quartz grains, bedding, porosity, and a white streak; quartz-rich material scratches glass, while calcite-rich rock fizzes in dilute hydrochloric acid. Common worldwide, especially in sedimentary basins.