mineral

White Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to waxy (when river-worn); Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

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

Identified April 12, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal activity or within igneous and metamorphic rocks. This specific specimen is a tumbled pebble, meaning its rounded shape was created by the abrasive action of water (river or ocean) over hundreds or thousands of years.

Uses & applications

Quartz is used in glassmaking, abrasives, timekeeping (piezoelectric properties), and construction. Polished pebbles like this are frequently used for landscaping, aquarium gravel, or as pocket stones for collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear, but the 'milky' white color of this specimen is caused by tiny fluid inclusions of gas and/or liquid trapped during crystal growth.

Field identification & locations

Identify in the field by its inability to be scratched by a steel knife (hardness 7) and its smooth, waxy feel when water-worn. Common in riverbeds, beaches, and mountain trails worldwide.