mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Cloudy white to grayish
Luster: Vitreous (glassy) to greasy

Identified June 14, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in hydrothermal veins and pegmatites through the cooling of silica-rich fluids. It is found in all geological ages and represents one of the most common minerals in the Earth's crust.

Uses & applications

Used in the manufacture of glass, ceramics, and abrasives. High-quality specimens are used in electronics for their piezoelectric properties. Also common in landscaping and as a decorative stone.

Geological facts

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

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and white cloudy appearance. Commonly found in mountain ranges and riverbeds globally.