mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Translucent tan to light brownish-gray. Luster: Vitreous to waxy. Fracture: Conchoidal. Crystal structure: Hexagonal/Trigonal. Specific gravity: ~2.65.

Hardness: 7 on Mohs scale
Color: Translucent tan to light brownish-gray
Luster: Vitreous to waxy

Identified July 27, 2026More mineral →

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

Hardness: 7 on Mohs scale. Color: Translucent tan to light brownish-gray. Luster: Vitreous to waxy. Fracture: Conchoidal. Crystal structure: Hexagonal/Trigonal. Specific gravity: ~2.65.

Formation & geological history

Formed by the weathering, erosion, and river transport of quartz veins or quartz-rich igneous/metamorphic rocks. Tumbled and rounded naturally by water action over geological time.

Uses & applications

Used extensively in lapidary work, decorative landscaping, aquariums, and general pebble collecting. Pure quartz is also used in optics and glassmaking.

Geological facts

Quartz is one of the most abundant minerals on Earth's continental crust. Its high hardness and lack of cleavage allow pebbles like this to survive long transport in rivers and along coasts without breaking down easily.

Field identification & locations

Identified in the field by its ability to scratch glass (Hardness 7), translucent appearance, smooth water-worn surface, and lack of distinct cleavage planes. Commonly found in riverbeds, gravel pits, and beach deposits worldwide.