mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

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

Identified May 13, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the cooling of magma or hydrothermal activity in veins. The cloudy appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. They are found across all geological eras.

Uses & applications

Used in glassmaking, abrasives, and as a source of silicon for electronics. While cloudy specimens are less common in jewelry than clear quartz, they are widely used in landscaping and as decorative 'healing' crystals.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz specifically gets its white color from millions of microscopic fluid inclusions that scatter light.

Field identification & locations

Identified in the field by its hardness (will scratch glass), lack of cleavage, and white opaque color. It is ubiquitous in mountainous regions and riverbeds worldwide.