sedimentary

Rounded sandstone or quartzite pebble

Quartz-rich sandstone; possibly weakly metamorphosed quartzite (SiO₂-dominant)

AI-generated identification · may be incorrect

Tan to brown, fine-grained, dull to faintly silky luster, rounded and water-worn with small pits. Likely hardness 6–7; quartzite is harder and more resistant than sandstone, with no obvious cleavage.

Identified September 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Probably weathered from a quartz-rich bedrock source and rounded by stream or beach transport; exact geological age and formation cannot be determined from the photograph.

Uses & applications

Primarily a natural aggregate, landscaping stone, or collector specimen; quartzite can be used for construction, paving, and decorative stone, while sandstone is used for building and masonry.

Geological facts

The smooth shape reflects abrasion during transport, and the rusty coloration commonly comes from iron-oxide staining. A close-up or fresh fracture is needed to distinguish sandstone from quartzite confidently.

Field identification & locations

Common in streambeds, beaches, gravel deposits, and glacial sediments. Sandstone shows visible sand grains and may scratch glass weakly; quartzite has interlocking grains, a sugary fracture, and readily scratches glass.