mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white, grey, or translucent color, vitreous luster, trigonal crystal system, 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, typically white, grey, or translucent color, vitreous luster, trigonal crystal system, no true cleavage, specific gravity of 2.65.

Formation & geological history

Formed through the crystallization of silica-rich solutions or magmas, and subsequently weathered, transported, and rounded by water action in rivers or marine environments.

Uses & applications

Used in landscaping, decorative stone, glass manufacturing, abrasives, and electronic oscillators.

Geological facts

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

Field identification & locations

Can be identified by its high hardness (scratches glass), conchoidal fracture, and lack of cleavage. Commonly found in riverbeds, beaches, and alluvial deposits worldwide.