mineral

White Quartz (Tumbled)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous (glass-like); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent
Luster: Vitreous (glass-like)

Identified March 8, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous (glass-like); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed through the crystallization of silica-rich molten rock (magma) or from hydrothermal veins. This specimen appears to be water-worn or mechanically tumbled, resulting in its smooth, rounded shape.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and widely sold as decorative 'pocket stones' or used in jewelry and landscaping.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear, but 'milky' white quartz gets its color from tiny fluid inclusions of gas or liquid trapped during crystal growth.

Field identification & locations

Identify in the field by its ability to scratch glass and its lack of cleavage. Commonly found in riverbeds, beaches, and mountainous regions worldwide. It is a staple for beginner rock collectors.