sedimentary

Weathered brown rock fragment (likely sandstone or iron-stained quartzite)

Indeterminate; probable quartz-rich sandstone, SiO₂-dominated

AI-generated identification · may be incorrect

Tan-brown, granular and earthy with darker iron-oxide staining; likely quartz-rich, with Mohs hardness about 6–7, dull to slightly glassy luster, and no obvious cleavage. The image is insufficient to confirm grain size or texture.

Identified August 14, 2026More sedimentary →

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At a glance

Common name: Weathered brown rock fragment (likely sandstone or iron-stained quartzite)
Scientific name: Indeterminate; probable quartz-rich sandstone, SiO₂-dominated
Category: sedimentary
Identified: August 14, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an unidentified common fragment; more only if locality, texture, or provenance makes it scientifically or aesthetically 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

If sandstone, it formed from compacted and cemented sand, commonly during the Paleozoic–Mesozoic; if quartzite, it is metamorphosed sandstone. Iron oxidation during weathering produced the brown coloration.

Uses & applications

Unremarkable fragments are mainly teaching or hobby specimens; sandstone is used as building stone and aggregate, while quartzite is used for paving, countertops, and durable aggregate.

Geological facts

The brown color commonly reflects hematite or limonite coatings rather than the rock’s primary minerals. A steel nail or glass-scratch test can help distinguish quartz-rich material from softer sedimentary rock.

Field identification & locations

Likely locations include weathered sandstone or quartzite terrains worldwide. Examine a fresh break for visible sand grains, test hardness, and apply dilute hydrochloric acid only if carbonate cement is suspected.