mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: White to cloudy, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified April 7, 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 cloudy, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & geological history

Formed through the crystallization of magma or from hydrothermal solutions. The cloudy white appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. They are found in volcanic, sedimentary, and metamorphic environments.

Uses & applications

Used as a source of silica for glassmaking, abrasives, in electronics for its piezoelectric properties, and as a decorative stone in landscaping or jewelry.

Geological facts

Quartz is one of the most abundant minerals in the Earth's continental crust. Milky quartz can often occur in massive veins that carry precious metals like gold.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), white cloudy color, and lack of cleavage (it breaks with curved, glass-like surfaces). Found globally in gravel pits and mountain veins.