sedimentary

Rounded weathered stone, likely quartz-rich sandstone or iron-stained quartzite

Indeterminate; probable quartz (SiO₂)-rich clastic rock with iron-oxide staining

AI-generated identification · may be incorrect

Brown-gray, subrounded pebble with a dull to slightly gritty luster and visible pale granular patches; likely hardness about 6–7, no obvious cleavage, and moderate-to-high durability. The image is insufficient to determine exact texture, density, or crystal structure.

Identified August 26, 2026More sedimentary →

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At a glance

Common name: Rounded weathered stone, likely quartz-rich sandstone or iron-stained quartzite
Scientific name: Indeterminate; probable quartz (SiO₂)-rich clastic rock with iron-oxide staining
Category: sedimentary
Identified: August 26, 2026
Method: Standard

AI Estimated Value

About $1–$10 as an ordinary pebble; up to $10–$30 if unusually attractive, locality-specific, or sold as a curated specimen.

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

Likely formed from compacted quartz-rich sediment later cemented into sandstone, then naturally rounded by stream or beach transport; iron oxides produced the brown coloration. Geological age cannot be determined visually.

Uses & applications

Typically used as a landscaping, decorative, or educational specimen; not generally valuable for jewelry or construction unless part of an attractive aggregate.

Geological facts

Its rounded shape indicates abrasion during transport, while the rusty color commonly reflects hematite or goethite coatings. A glass-scratch test can help distinguish quartz-rich material from softer sedimentary rocks.

Field identification & locations

Common in river gravels, beaches, and glacial deposits worldwide. Confirm identification by examining a fresh surface, testing hardness, and checking for gritty grains or acid reaction; the specimen could also be a weathered quartzite or concretion.