mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Identified August 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed via weathering and mechanical erosion of larger quartz-bearing rocks like granite or quartzite. Over long periods, water action in rivers or shorelines tumbles the quartz into smooth, rounded pebbles.

Uses & applications

Used in landscaping, decorative gravel, raw material for glassmaking, and polished as a low-cost tumbled gemstone or talisman by collectors.

Geological facts

Quartz is one of the most abundant and durable minerals in Earth's continental crust. Its high resistance to chemical weathering allows it to survive long transport cycles where other minerals dissolve or break down.

Field identification & locations

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