mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

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

Identified June 6, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to milky; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed from hydrothermal solutions or cooling magma where gas bubbles and fluid inclusions create a milky appearance. This specimen appears water-worn, typically found in riverbeds or coastal areas.

Uses & applications

Used in glass making, as an abrasive, in electronics for its piezoelectric properties, and widely as decorative gravel or for gemstone tumbling.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Its white color is caused by minute fluid inclusions of gas or liquid trapped during crystal growth.

Field identification & locations

Identify in the field by its white color, inability to be scratched by steel, and its smooth, rounded texture if found in water. It is found globally in almost every geological environment.