mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

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

Identified June 13, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal fluids in veins or as the final stage of cooling in igneous pegmatites. It is one of the most common minerals on Earth's crust.

Uses & applications

Used in the production of glass, ceramics, and abrasives. In jewelry, it is often tumbled or cut into cabochons. High-purity quartz is essential for making silicon wafers for electronics.

Geological facts

The cloudy white appearance is caused by tiny inclusions of gas and/or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. Often found as rounded pebbles in stream beds, beaches, or as veins in mountain ranges. It is resistant to weathering.