metamorphic

Water-worn pebble, likely quartzite

Quartzite (predominantly recrystallized quartz, SiO₂); identification from the image is tentative

AI-generated identification · may be incorrect

The small, rounded tan-brown pebble has a smooth, slightly glossy surface. Quartzite typically has Mohs hardness 7, a granular crystalline texture, and no obvious cleavage; the photo does not show enough detail to confirm its composition or luster.

Identified September 27, 2026More metamorphic →

Explore Water-worn pebble, likely quartzite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Quartzite forms when quartz-rich sandstone is recrystallized by heat and pressure during metamorphism. Its age and geological source cannot be determined from the image; rounding likely resulted from transport by water.

Uses & applications

Quartzite is used as crushed stone, building and paving material, and decorative stone; this pebble is mainly of casual collecting value.

Geological facts

Quartzite is commonly hard enough to scratch glass and resists weathering, which helps rounded pebbles persist in streams and gravel.

Field identification & locations

Look for a hard, sugary-looking quartz texture and fracture surfaces that cut through grains rather than around them. Quartzite occurs worldwide in metamorphic terrains and derived river or beach gravels.