mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: translucent white to cloudy; Luster: vitreous (glassy) to greasy; Crystal structure: Trigonal (Hexagonal); Cleavage: Poor/None (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: translucent white to cloudy
Luster: vitreous (glassy) to greasy

Identified July 11, 2026More mineral →

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Physical properties

Formation & geological history

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

Uses & applications

Used in glass manufacturing, as an abrasive, and in electronics for its piezoelectric properties. In common forms, it is used for landscaping, construction aggregate, and as a gemstone for beads.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz specifically is the most common variety of crystalline quartz.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and characteristic greasy luster on fracture surfaces. Found globally in almost all geological environments.