sedimentary

Weathered sandstone or iron-stained quartzite pebble

Likely quartz-rich sandstone (mostly SiO₂), possibly weakly metamorphosed quartzite

AI-generated identification · may be incorrect

Tan-brown, dull to slightly earthy luster, rounded by abrasion, and visibly granular or weathered. Quartz-rich material is typically Mohs 6–7, with no obvious cleavage; exact identification requires a fresh surface and hardness test.

Identified September 11, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or iron-stained quartzite pebble
Scientific name: Likely quartz-rich sandstone (mostly SiO₂), possibly weakly metamorphosed quartzite
Category: sedimentary
Identified: September 11, 2026
Method: Standard

AI Estimated Value

Usually $0–$5 as an unattributed pebble; perhaps $5–$20 if distinctive, proven local, or part of a labeled collection.

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

Most likely formed from compacted and cemented quartz sand, then rounded in a stream or shoreline environment; iron-oxide weathering produces the brown color. Its age cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building stone, aggregate, and landscaping material; an ordinary pebble has little commercial or jewelry use.

Geological facts

The specimen’s rounded shape indicates transport after formation. A streak or scratch test can distinguish it from softer mudstone or shale.

Field identification & locations

Look for individual sand grains, layered bedding, and whether a steel knife scratches it; quartz-rich rock resists scratching, while sandstone may crumble or shed grains. Common worldwide in sedimentary terrains and river gravels.