mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, white to translucent or brownish color, vitreous luster, hexagonal crystal system, no 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 translucent or brownish color, vitreous luster, hexagonal crystal system, no cleavage, specific gravity of 2.65

Formation & geological history

Formed through the crystallization of silica-rich solutions or cooling magma, subsequently weathered, transported, and rounded by water action in river or beach environments over millions of years

Uses & applications

Used in landscaping, decorative gravel, glassmaking, electronics, and as a pocket specimen for rock collectors

Geological facts

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

Field identification & locations

Easily identified by its high hardness (scratches glass), lack of cleavage, and resistance to weathering; commonly found in riverbeds, beaches, and gravel deposits worldwide