mineral

Milky Quartz

Silicon dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, semi-translucent to opaque; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White, semi-translucent to opaque
Luster: Vitreous to greasy

Identified April 6, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, semi-translucent to opaque; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed through the crystallization of magma or from hydrothermal veins. Milky quartz specifically gets its white, cloudy appearance from tiny fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used widely in glass making, ceramics, and abrasives. High-purity quartz is essential in electronics for its piezoelectric properties. It is also common in landscaping and as a decorative stone.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz. It often appears in massive veins that can be several meters thick and many kilometers long.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and white cloudy appearance. Often found in mountainous regions, stream beds, and gravel pits.