sedimentary

Sandstone Pebble / Quartzite Pebble

SiO2 (Silicon Dioxide enriched sedimentary rock)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Reddish-brown to tan; Luster: Dull to earthy; Texture: Fine-grained, abrasive feel, well-rounded triangular shape from water erosion; Specific Gravity: approx. 2.65

Hardness: 6-7 on Mohs scale
Color: Reddish-brown to tan
Luster: Dull to earthy

Identified July 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation, compaction, and cementation of sand-sized mineral grains or rock fragments (predominantly quartz and feldspar), followed by erosion and rounded smoothing in a stream, river, or coastal beach environment.

Uses & applications

Commonly used as construction aggregate, landscaping gravel, or river rock decor. Smooth pebbles are also gathered for rock tumbling and decorative crafts.

Geological facts

River pebbles like this specimen often undergo hundreds or thousands of years of natural water transport, which grinds away sharp edges to produce smooth, sub-triangular or oval shapes.

Field identification & locations

Identified by its sandy, grainy texture, uniform brownish coloration, and smooth, water-worn edges. Very common in riverbeds, glacial tills, and coastal deposits globally.