mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white or colorless, vitreous luster, conchoidal fracture, no true cleavage, specific gravity of 2.65.

Identified August 6, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, typically white or colorless, vitreous luster, conchoidal fracture, no true cleavage, specific gravity of 2.65.

Formation & geological history

Formed through crystallization from silicate melts in igneous rocks or as a precipitate in hydrothermal veins. Over long periods of time, weathering and water transport erode and smooth the quartz into rounded pebbles.

Uses & applications

Used in landscaping, decorative stone, glass manufacturing, electronics, and lapidary work.

Geological facts

Quartz is one of the most abundant and durable minerals in Earth's continental crust, making up a large percentage of beach sand and river pebbles.

Field identification & locations

Easily identifiable by its high hardness (scratches glass), lack of cleavage, and resistance to chemical weathering. Found worldwide in rivers, streams, and beaches.