mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

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

Identified July 8, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal veins or within igneous pegmatites. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used as a source of silicon for semiconductors, glass making, abrasives, landscaping, and in crystal healing/collecting circles.

Geological facts

Milky quartz is the most common variety of crystalline quartz. While often overlooked for clearer varieties, large masses can form spectacular mountains or 'white reefs' in geological formations.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), its lack of cleavage, and its distinctive cloudy white color. Commonly found in gravel pits, mountain ranges, and as river stones worldwide.