mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, white to translucent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Identified August 1, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, white to translucent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Formation & geological history

Forms in a wide variety of geological environments including igneous, metamorphic, and sedimentary rocks. Often weathered out of parent rock and rounded into pebbles via water transport in rivers or ocean beaches.

Uses & applications

Used in landscaping, decorative gravel, glassmaking, abrasives, and gemstone carving or lapidary work.

Geological facts

Quartz is one of the most abundant and durable minerals on Earth's continental crust. Its high resistance to both mechanical and chemical weathering allows it to survive long transport distances, often outlasting almost all other minerals in a sedimentary deposit.

Field identification & locations

Easily identified in the field by its high hardness (scratches glass easily), lack of cleavage, and glassy or waxy luster. Found worldwide in stream beds, beaches, and conglomerate rock formations.