mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 (Mohs scale); Color: White to translucent; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: White to translucent
Luster: Vitreous to greasy

Identified April 20, 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 translucent; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. The white color is caused by tiny inclusions of gas and/or liquid trapped during crystal growth. Found in almost all geological environments.

Uses & applications

Used in the glass and ceramics industry, as an abrasive, in decorative landscaping, and occasionally as a low-cost gemstone or for spiritual/collection purposes.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky Quartz specifically gets its 'cloudy' appearance from microscopic fluid inclusions that date back to the time the crystal was forming.

Field identification & locations

Identify in the field by its hardness (it should scratch glass), its lack of cleavage, and its waxy or vitreous luster. It is commonly found in gravel pits, riverbeds, and as veins in mountain outcrops.