mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Cloudy white to opaque grey/yellow; Luster: Vitreous (glassy) to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Cloudy white to opaque grey/yellow
Luster: Vitreous (glassy) to greasy

Identified March 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, pegmatites, and igneous rocks through the cooling of silica-rich fluids. Can be found in rocks from almost any geological era due to its extreme stability.

Uses & applications

Used as a gemstone (cabochons), in glassmaking, as a source of silicon for electronics, and in construction as an aggregate or decorative stone.

Geological facts

Milky quartz gets its white color from tiny bubbles of gas or liquid trapped during crystal growth. It is the most common variety of crystalline quartz found on Earth's surface.

Field identification & locations

Identify in the field by its hardness (scratches glass/steel), lack of cleavage, and white 'milky' appearance. Found globally in mountainous regions, riverbeds, and as core veins in granite. Collectors look for pieces with large crystal points or distinct impurities.