mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Opaque white to translucent
Luster: Vitreous to greasy

Identified July 16, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Forms in hydrothermal veins, pegmatites, and as a primary constituent in igneous rocks like granite. The white color is caused by tiny inclusions of liquid or gas trapped during crystal growth.

Uses & applications

Used as a source of silica for glassmaking and silicon production, in construction as aggregate, and in landscaping or jewelry (rarely high value).

Geological facts

Milky quartz is the most common variety of crystalline quartz. While often overlooked by collectors for rarer varieties, massive milky quartz veins can often host gold mineralization.

Field identification & locations

Identify in the field by its hardness (will scratch glass), white color, and lack of cleavage planes. Found globally in almost all geological environments.