mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

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

Identified June 8, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in hydrothermal veins or as a late-stage mineral in igneous pegmatites. The white 'milky' color is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glass making, as an abrasive, in the production of silicon chips, as decorative landscaping stone, and as a collector's specimen.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It is often found in the same veins as gold and serves as an important indicator for prospectors.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and opaque white appearance. It is found globally and is abundant in mountainous regions or inside gravel riverbeds.