mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness 7 on the Mohs scale, vitreous to greasy luster, trigonal crystal system, white to translucent milky color, no true cleavage, conchoidal fracture

Identified July 24, 2026More mineral →

Explore Milky Quartz in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness 7 on the Mohs scale, vitreous to greasy luster, trigonal crystal system, white to translucent milky color, no true cleavage, conchoidal fracture

Formation & geological history

Forms through the crystallization of silica-rich fluids in pegmatites, hydrothermal veins, and metamorphic rocks. Milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, silicon production, electronics, abrasives, decorative stone, and gemstone collecting

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz often forms the matrix for ore minerals such as gold and copper in hydrothermal vein deposits.

Field identification & locations

Can be identified by its hardness (scratches glass), lack of cleavage, and translucent milky-white color. Extremely common globally in mountain regions, gravel beds, and quartz veins.