mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White to translucent cloudy; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.65.

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

Identified March 31, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White to translucent cloudy; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed through the cooling of silica-rich magma or precipitation from hydrothermal veins. The milky appearance is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth. They can be found in rocks from all geological ages.

Uses & applications

Used as a source of silicon for semiconductors and glass making. In construction, it is used as an aggregate. It is also popular in jewelry as cabochons, metaphysical healing collections, and landscaping decor.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz. Some milky quartz contains traces of gold within its veins, making it a target for gold prospectors.

Field identification & locations

Identify in the field by its ability to scratch glass and its lack of cleavage. It is found globally, particularly in pegmatites and mountain ranges. Collectors should look for specimens with distinct crystal faces or 'druzy' coatings.