mineral

White Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Milky white to translucent; Luster: Vitreous/glassy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: Milky white to translucent
Luster: Vitreous/glassy

Identified June 29, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Milky white to translucent; Luster: Vitreous/glassy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Formation & geological history

Formed through the cooling of magma or hydrothermal deposition in veins. These specific specimens are river-worn or beach-tumbled pebbles, meaning their smooth shape is the result of mechanical erosion over hundreds to thousands of years.

Uses & applications

Commonly used in landscaping (decorative garden stones), aquariums, construction aggregate, and as a source of silica for glassmaking. Smooth tumbled versions are often used for meditation stones or 'worry stones'.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The white 'milky' color is caused by tiny fluid inclusions of gas or liquid trapped during the crystal's growth.

Field identification & locations

Can be identified in the field by its hardness (it will scratch glass) and lack of cleavage. Found globally in riverbeds, beaches, and mountain washouts. Collectors look for pieces with high translucency or unique inclusions.