mineral

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White to Opaque; Luster: Vitreous (glassy) to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White to Opaque
Luster: Vitreous (glassy) to waxy

Identified March 8, 2026More mineral →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 7 (Mohs scale); Color: White to Opaque; Luster: Vitreous (glassy) to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the crystallization of magma or from hydrothermal veins. The white 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. They can be found in a wide variety of geological ages.

Uses & applications

Used in the glassmaking industry, as an abrasive, in electronics (due to piezoelectric properties), construction aggregate, and as tumbled stones for decorative jewelry or metaphysical collections.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of crystalline quartz and is often found in massive form rather than distinct crystals.

Field identification & locations

Identify in the field by its hardness (it can scratch glass and steel), lack of cleavage, and white opaque color. It is commonly found in gravel beds, mountain ranges, and within quartz veins. Collectors should look for smoothness in water-worn river pebbles.