mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent with inclusions; Luster: Vitreous/Waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to translucent with inclusions
Luster: Vitreous/Waxy

Identified June 15, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: White to translucent with inclusions; Luster: Vitreous/Waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through crystallization of silica-rich magma or precipitation from hydrothermal veins. This specimen shows water-worn rounding, suggesting origin from a riverbed or coastal environment.

Uses & applications

Commonly used as decorative gravel, in glass making, as an abrasive, and sometimes tumbled for beginner jewelry or aquarium decor.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its clouded appearance from tiny fluid inclusions of gas or liquid trapped during crystal growth.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. Look for it in gravel pits, riverbanks, and beaches worldwide. It is a fundamental component of many other rocks like granite and sandstone.