sedimentary

Weathered river pebble (likely iron-stained rock)

Indeterminate from the image; possibly iron-oxide-stained quartzite or sandstone

AI-generated identification · may be incorrect

Rounded, brown to ochre surface with dark patches and a dull, weathered luster. Hardness, cleavage, and specific gravity cannot be reliably determined visually; the specimen appears fine-grained and lacks visible crystals.

Identified October 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Water-rounded during transport, with brown coloration likely from iron-oxide staining. The source rock’s age and exact formation process cannot be established from appearance alone.

Uses & applications

Primarily a natural-history or decorative specimen; no specific industrial use can be identified without determining its composition.

Geological facts

Pebble shape records abrasion and transport by flowing water or waves; iron oxides commonly stain otherwise pale rocks brown or red.

Field identification & locations

Look for grain size, layering, or a fresh broken surface; hardness and an acid test can help distinguish quartz-rich rock from carbonate rock. Rounded pebbles occur in riverbeds and beaches worldwide.