mineral

Milky 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 March 25, 2026More mineral →

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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 milky appearance is caused by tiny inclusions of liquid or gas trapped during crystal growth. Can be found in geological formations of almost any age.

Uses & applications

Used in glassmaking, as an abrasive, in the production of silicon wafers for electronics, as ornamental stone in landscaping, and occasionally in jewelry as cabochons.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of crystalline quartz found in nature. Many gold deposits are found hosted within milky quartz veins.

Field identification & locations

Identify in the field by its ability to scratch glass and its lack of cleavage. It is found globally, common in granitic rocks and as mountain 'veins'. Collectors look for large, well-formed crystal clusters.