mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

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

Formation & geological history

Formed via hydrothermal processes or crystallization in igneous, metamorphic, and sedimentary environments. Water action often smooths and rounds raw chunks into pebbles in riverbeds or coastal environments over long geological time periods.

Uses & applications

Used in landscaping, decorative stone, gemstone carving, glass production, electronics, and mineral collections.

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

Easily identified by its high hardness (scratches glass), lack of cleavage, and smooth water-worn shape. Found worldwide in streambeds, beaches, and gravel deposits.