metamorphic

Quartz-rich river pebble, possibly quartzite

Quartz (SiO₂); possibly quartzite, a rock composed predominantly of recrystallized quartz

AI-generated identification · may be incorrect

Creamy white to tan, rounded and dull-to-vitreous with a granular-looking pale patch. Quartz hardness is 7 Mohs, hexagonal crystal system, no cleavage; exact identification and specific gravity cannot be determined from the photo.

Identified September 29, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely a naturally rounded pebble produced by weathering and water transport; if quartzite, it formed when quartz sandstone was metamorphosed. Its age and original source are not apparent.

Uses & applications

Primarily a natural-history or decorative specimen; quartzite is also used as aggregate, paving, and dimension stone.

Geological facts

Quartz-rich pebbles can resemble quartzite, vein quartz, or other pale rocks; a close inspection of grain boundaries and fracture is needed to distinguish them.

Field identification & locations

The rounded shape suggests transport by water or abrasion, but the pictured surface alone is insufficient for a firm rock identification. Quartz-rich pebbles are widespread in river gravels and beaches worldwide.