mineral

Milk Quartz

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Cloudy white to opaque
Luster: Vitreous to greasy

Identified June 20, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Cloudy white 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 silica-rich hydrothermal fluids in veins or as a late-stage mineral in igneous pegmatites. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in the glass and ceramics industry, as a source of silicon for electronics, in landscaping, and as decorative pocket stones or healing crystals.

Geological facts

Also known as Snow Quartz, it is the most common variety of crystalline quartz. While often overlooked for clearer varieties, large masses can form massive quartz veins that span miles.

Field identification & locations

Identify by its ability to scratch glass and its lack of cleavage. It is found globally in almost every geological environment, particularly in mountain ranges and gravel deposits.