mineral

White Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale; color is primarily white or milky; vitreous to greasy luster; crystal system is trigonal; no true cleavage, exhibits conchoidal fracture; specific gravity of 2.65.

Identified July 29, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale; color is primarily white or milky; vitreous to greasy luster; crystal system is trigonal; no true cleavage, exhibits conchoidal fracture; specific gravity of 2.65.

Formation & geological history

Formed in a wide variety of geological environments, frequently crystallizing from hydrothermal solutions or cooling magmas, and often weathered and rounded into pebbles by water transport in rivers or beaches over thousands to millions of years.

Uses & applications

Used in landscaping, decorative stone, manufacturing of glass and silicon, and occasionally in lapidary work or as a gemstone.

Geological facts

Quartz is one of the most abundant and ubiquitous minerals in the Earth's continental crust. Milky quartz gets its white color from microscopic liquid inclusions trapped during crystal growth.

Field identification & locations

Easily identified by its high hardness (scratches glass), white color, and lack of cleavage. Commonly found in riverbeds, beaches, and quartz veins worldwide.