mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Hardness: 7 on the Mohs scale
Color: Opaque white to translucent
Luster: Vitreous (glassy) to greasy

Identified March 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal solutions or cooling magma. It is commonly found in igneous pegmatites and metamorphic veins. Milky quartz gets its appearance from microscopic inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in the glass and ceramic industries, as an abrasive, and in the production of silicon metal. In landscaping and construction, it is used for decorative gravel. It is also a popular stone for tumble polishing and beginner geology collections.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it was used by many ancient cultures for tool making due to its hardness and sharp edges when broken. It is often found associated with gold in hydrothermal veins.

Field identification & locations

Identify in the field by its distinct white color, lack of cleavage, and its ability to scratch glass easily. It is found globally, particularly in areas with granitic rocks or mountain ranges. Collectors should look for vugs or veins in metamorphic or igneous outcrops.