mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to waxy (when water-worn); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent
Luster: Vitreous to waxy (when water-worn)

Identified May 30, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. This specific specimen is a 'clast' that has been weathered and rounded by water transport in a river, beach, or glacial environment.

Uses & applications

Common quartz is used in glassmaking, abrasives, and as a component in concrete. Smooth pebbles are often used in landscaping, aquariums, and home decor.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why it often remains as pebbles long after other minerals have dissolved.

Field identification & locations

Identify in the field by its hardness (it will scratch glass) and lack of cleavage. Look for it in stream beds, gravel pits, and beaches globally. It is a fundamental indicator mineral for many geological environments.