mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white or translucent color, vitreous luster, hexagonal crystal system, conchoidal fracture, and specific gravity of 2.65.

Identified July 30, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, typically white or translucent color, vitreous luster, hexagonal crystal system, conchoidal fracture, and specific gravity of 2.65.

Formation & geological history

Formed through crystallization from silica-rich hydrothermal solutions or magmas, and often weathered and rounded by water transport in rivers or beaches over millions of years.

Uses & applications

Used in glassmaking, abrasives, electronics, ornamental items, and as a common landscaping or decorative stone.

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

Easily identified by its high hardness (scratches glass), lack of cleavage, and resistance to acid. Found worldwide in stream beds, beaches, and sedimentary deposits.