mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: White to translucent milky
Luster: Vitreous to greasy

Identified May 6, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in hydrothermal veins or as a constituent of igneous rocks like granite. Often found in pegmatites and metamorphic rocks. Formation can span geological ages from Precambrian to recent.

Uses & applications

Used as a source of silicon for electronics, an abrasive, in glassmaking, construction aggregate, and as a decorative stone/gemstone for entry-level collectors.

Geological facts

The milky white appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. It is one of the most common minerals in the Earth's crust.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), lack of cleavage, and white waxy look. Common globally in mountain ranges and river beds.