mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent tan; Luster: Vitreous to waxy (when tumbled); Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent tan
Luster: Vitreous to waxy (when tumbled)

Identified March 24, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent tan; Luster: Vitreous to waxy (when tumbled); Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. This specific specimen has been chemically and mechanically weathered, likely tumbled in a stream or shoreline over thousands of years to achieve its smooth, rounded shape.

Uses & applications

Used widely in glassmaking, electronics (due to piezoelectric properties), construction aggregates, and as decorative landscape stones or tumbled pocket stones for collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which has Slavic origins meaning 'hard'. It is the primary component of most beach sand.

Field identification & locations

Identify in the field by its ability to scratch glass and its lack of cleavage. It is commonly found in riverbeds, beaches, and glacial till globally. Collectors often look for clarity or unique inclusions.