metamorphic

Rounded quartzite pebble

Quartzite, composed predominantly of quartz (SiO₂)

AI-generated identification · may be incorrect

The smooth, rounded pebble is pale tan-gray with a subtly sparkly, granular surface. Quartz has Mohs hardness 7, vitreous-to-sugary luster, and trigonal crystal structure; individual grains are too small to identify confidently from the image.

Identified October 14, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartz-rich sandstone recrystallizes under heat and pressure into interlocking quartz grains. Quartzite forms in metamorphic terrains across many geological ages; this pebble’s age and source cannot be determined visually.

Uses & applications

Quartzite is used as crushed stone, building and decorative stone, and occasionally for lapidary work. This small pebble is mainly suitable for collecting or display.

Geological facts

Quartzite is generally harder and more resistant to weathering than its sandstone precursor. Its rounded shape likely reflects transport and abrasion in a stream or shoreline environment.

Field identification & locations

Look for a hard, quartz-rich rock with a sugary sparkle and grains that resist scratching by a steel knife; rounded edges suggest transport. Quartzite occurs worldwide, especially in mountain belts and river gravels.