mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 (Mohs scale); Color: Cloudy white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

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

Identified June 18, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 7 (Mohs scale); Color: Cloudy white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Formation & geological history

Forms in various geological environments, most commonly from hydrothermal veins or cooling magma in pegmatites. The milky appearance is caused by microscopic inclusions of fluids or gas trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, jewelry (cabochons), and as a gemstone for collectors or metaphysical purposes. High-purity quartz is also essential in electronics.

Geological facts

Milky quartz is one of the most common varieties of crystalline quartz found on Earth's crust. It often forms the 'bulk' of white veins seen in mountain outcrops.

Field identification & locations

Identify by its ability to scratch glass, its lack of cleavage, and its waxy/greasy luster when weathered. Widely found in riverbeds, gravel pits, and mountain ranges globally.