mineral

Milky Quartz Pebbles

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Milky white to translucent
Luster: Vitreous to waxy

Identified May 21, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the crystallization of silica from hydrothermal solutions or igneous cooling. These smooth specimens are river-worn or beach-tumbled clasts, likely dating from various geologic eras depending on the parent vein.

Uses & applications

Used in glassmaking, abrasive manufacturing, landscaping, as decorative gravel, and occasionally for healing crystal collection or lapidary tumbling.

Geological facts

Milky quartz gets its white color from tiny bubbles of gas or liquid trapped during crystal growth. It is the most common variety of crystalline quartz found on Earth.

Field identification & locations

Identify by its hardness (it will scratch glass), lack of cleavage, and white opaque color. Commonly found in riverbeds, glacial deposits, and mountain streams globally.