sedimentary

Iron-stained quartz-rich rock, possibly weathered sandstone

Quartz-rich sandstone with limonite/goethite staining; exact identification requires testing

AI-generated identification · may be incorrect

Tan-brown, rough, earthy surface with granular texture and rusty orange iron-oxide coating. Likely dominated by quartz; quartz hardness is 7, while the weathered matrix may be softer, with dull to slightly vitreous luster and no obvious cleavage.

Identified September 1, 2026More sedimentary →

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At a glance

Common name: Iron-stained quartz-rich rock, possibly weathered sandstone
Scientific name: Quartz-rich sandstone with limonite/goethite staining; exact identification requires testing
Category: sedimentary
Identified: September 1, 2026
Method: Standard

AI Estimated Value

Usually $2–$15 as an ordinary specimen; up to roughly $20–$50 if unusually attractive, locality-labeled, or associated with visible crystals.

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 formed as sand-sized quartz grains lithified into sandstone, then oxidized and weathered near the surface. The depositional age cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and occasionally as a collector specimen; iron staining mainly adds color rather than commercial value.

Geological facts

Limonite and goethite produce the characteristic yellow, orange, and brown coloration. A scratch test and fresh broken surface would help distinguish sandstone from iron-rich quartz or altered rock.

Field identification & locations

Look for visible sand grains and layering; quartz grains should scratch glass, while a steel nail may scratch the matrix. Common in sedimentary terrains worldwide, including deserts and oxidized outcrops.