mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Identified June 15, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from silica-rich hydrothermal solutions or as a primary constituent in igneous rocks like granite and pegmatites. The white color is caused by tiny inclusions of gas and/or liquid trapped during crystal growth.

Uses & applications

Used in electronics for its piezoelectric properties, as an abrasive in sandblasting, in glassmaking, as ornamental stone, and in jewelry (though less common than clear quartz).

Geological facts

Quartz is the second most abundant mineral in the Earth's continental crust. Milky quartz specifically is the most common variety of crystalline quartz found in nature.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and white 'milky' appearance. It is found globally in many environments including mountains, river beds, and beaches.