mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Hardness: 7 on Mohs scale
Color: Translucent white to opaque white
Luster: Vitreous to greasy

Identified June 30, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in hydrothermal veins or pegmatites from the cooling and solidification of silica-rich fluids. It can be found in a wide variety of igneous, metamorphic, and sedimentary environments worldwide.

Uses & applications

Used in construction as a component of concrete, in glassmaking, as a source for silicon in electronics, and in landscaping or decorative jewelry.

Geological facts

The white color is caused by tiny inclusions of liquid, gas, or both trapped during crystal growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identify by its hardness (scratches glass), white color, and lack of cleavage (breaks like glass). It is ubiquitous in mountainous areas, stream beds, and gravel pits.