mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Mohs hardness of 7, white to translucent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, lacks cleavage, specific gravity is 2.65.

Identified July 13, 2026More mineral →

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Physical properties

Mohs hardness of 7, white to translucent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, lacks cleavage, specific gravity is 2.65.

Formation & geological history

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

Uses & applications

Used in the manufacture of glass, ceramics, and sandpaper. Frequently used as decorative landscape stone, in jewelry (often as cabochons), and as a gemstone for 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 abundant minerals on Earth's surface.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), its white waxy color, and the way it breaks in curved shells (conchoidal fracture). It is ubiquitous in mountainous and riverbed areas.