mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to creamy white; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to creamy white
Luster: Vitreous to greasy

Identified June 2, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to creamy white; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids or magma. This specimen is a water-worn pebble likely from a riverbed or coastal environment.

Uses & applications

Used in glass making, ceramics, as an abrasive, and widely in landscaping or as aquarium gravel.

Geological facts

Milky quartz gets its cloudy appearance from minute fluid inclusions of gas and liquid trapped during crystal growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identify in the field by its white color, inability to be scratched by a steel knife, and lack of cleavage planes. Found globally in almost all geological environments.