mineral

White Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to opaque; Luster: Vitreous to waxy (when tumbled); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to opaque
Luster: Vitreous to waxy (when tumbled)

Identified June 28, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to opaque; Luster: Vitreous to waxy (when tumbled); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Quartz forms in a wide variety of environments, primarily through the cooling of silica-rich magma or from hydrothermal veins. This specific specimen suggests a water-worn or tumbled origin, likely from a riverbed or coastal environment where abrasive action smoothed its edges.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative stone in landscaping or low-cost jewelry/pocket stones.

Geological facts

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

Field identification & locations

Identify in the field by its hardness (it will scratch glass) and lack of cleavage. It is commonly found in riverbeds, beaches, and mountain trails globally. For collectors, look for clarity and absence of heavy fractures.