mineral

White Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous/glassy to waxy; Crystal System: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Milky white to translucent
Luster: Vitreous/glassy to waxy

Identified June 18, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous/glassy to waxy; Crystal System: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed through the cooling of silica-rich magma or precipitation from hydrothermal veins. This specimen appears water-worn (alluvial), likely shaped by river or beach erosion over thousands of years.

Uses & applications

Used in glass manufacturing, electronics (piezoelectric properties), abrasives, and as decorative stone in landscaping or jewelry (tumbled stones).

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear (rock crystal), but 'milkiness' in pebbles like this is caused by 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. Commonly found in stream beds, beaches, and soil worldwide. Collectors look for clarity or unique water-worn shapes.