mineral

Quartz pebble

Silicon dioxide (SiO2)

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

Identified July 30, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through crystallization from silica-rich hydrothermal solutions or cooling magma, frequently found weathered and rounded in sedimentary environments like streams and beaches.

Uses & applications

Used in glassmaking, electronics, abrasive materials, gemstone carving, and as decorative gravel.

Geological facts

Quartz is one of the most abundant and durable minerals in Earth's continental crust, able to withstand weathering that destroys other minerals.

Field identification & locations

Identified by its high hardness (scratches glass), lack of cleavage, and glassy luster. Commonly found worldwide in gravel beds, river bars, and sandy beaches.