mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: White/Translucent, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified June 15, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 7 (Mohs scale), Color: White/Translucent, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & geological history

Forms in hydrothermal veins or as a constituent of igneous and metamorphic rocks. Often crystallizes from cooling magma or hot mineral-rich solutions in host rock cavities. Found in formations ranging from billions of years old to recent quaternary deposits.

Uses & applications

Used as a gemstone in necklaces and bracelets, in glass manufacturing, as an abrasive, and in electronics for its piezoelectric properties. Used historically in tool making and construction aggregate.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its characteristic white color from microscopic inclusions of liquids or gases trapped during crystal growth.

Field identification & locations

Identify in the field by its hardness (will scratch glass easily), lack of cleavage, and white opaque appearance. Found globally, especially in mountain ranges, stream beds, and pegmatites. Collectors look for well-defined crystal faces.