mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Identified August 4, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, white to clear 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 in igneous, metamorphic, and sedimentary environments. Water and wind action over millions of years eroded and tumbled the quartz into a smooth pebble shape.

Uses & applications

Used in landscaping, decorative gravel, glassmaking, and mineral specimen collecting.

Geological facts

Quartz is one of the most abundant and durable minerals in Earth's continental crust, highly resistant to both chemical and mechanical weathering.

Field identification & locations

Can be identified in the field by its high hardness (scratches glass), lack of cleavage, and waxy or glassy luster. Found worldwide in stream beds, beaches, and glacial deposits.