metamorphic

Smooth gray-green pebble, likely quartzite

Quartzite, composed mainly of recrystallized quartz (SiO₂)

AI-generated identification · may be incorrect

Fine-grained, rounded, pale gray-green surface with a dull to slightly silky luster; quartz hardness is 7 Mohs, with no cleavage. The image alone does not show enough detail to confirm the identification or measure specific gravity.

Identified September 27, 2026More metamorphic →

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Physical properties

Formation & geological history

If quartzite, it formed when quartz-rich sandstone was metamorphosed under heat and pressure; its age and source cannot be determined from the photograph. Its smooth shape suggests abrasion during transport in water.

Uses & applications

Small pebbles are mainly used for collecting, crafts, or decorative landscaping; quartzite also serves as aggregate and building stone.

Geological facts

Quartzite is typically harder than its original sandstone and often breaks across, rather than around, its quartz grains.

Field identification & locations

A hard, gritty surface and scratch resistance can support quartzite identification, but a close view or testing is needed to distinguish it from other pale pebbles. Quartzite occurs worldwide in metamorphic terrains and river deposits.