mineral

Milky Quartz

Silicon Dioxide (SiO2)

White to cloudy translucent color; Mohs hardness of 7; vitreous luster in crystals, greasy in massive forms; hexagonal crystal system; conchoidal fracture with no cleavage; specific gravity of 2.65.

Identified July 19, 2026More mineral →

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Physical properties

White to cloudy translucent color; Mohs hardness of 7; vitreous luster in crystals, greasy in massive forms; hexagonal crystal system; conchoidal fracture with no cleavage; specific gravity of 2.65.

Formation & geological history

Forms in hydrothermal veins or as a primary constituent in igneous rocks like granite. The cloudy appearance is caused by microscopic inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used as an abrasive, in the production of glass and ceramics, as a source for silicon, and in jewelry or decorative landscaping as tumbled stones.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It can be found in almost every geological environment and often forms the matrix for gold deposits.

Field identification & locations

Identify by its ability to scratch glass and its lack of cleavage. It is ubiquitous in riverbeds and mountainous terrain. Collectors look for pieces with interesting internal veining or heavy inclusions.