sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, pink to translucent color due to trace minerals like iron or titanium, vitreous luster, hexagonal crystal system (though water-worn into an amorphous pebble), conchoidal fracture with no true cleavage, specific gravity of 2.65.

Identified August 5, 2026More sedimentary →

Explore Quartz Pebble 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

Formed from the weathering and erosion of parent igneous, metamorphic, or sedimentary rocks. Over long periods, wave action and river transport tumble and wear down angular quartz fragments into smooth, rounded pebbles found in beach, river, and marine environments.

Uses & applications

Used in landscaping, decorative stone, abrasive manufacturing, glass production, and as polished pocket stones or lapidary material for hobbyists.

Geological facts

Quartz is one of the most abundant and durable minerals in Earth's continental crust. Its high hardness and resistance to chemical weathering allow it to survive long transport distances where other minerals break down.