mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 (Mohs scale); Color: White to translucent; Luster: Vitreous/Glassy to Greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White to translucent
Luster: Vitreous/Glassy to Greasy

Identified June 26, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White to translucent; Luster: Vitreous/Glassy to Greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the crystallization of silica-rich magma or from hydrothermal veins. The white 'milky' appearance is caused by tiny inclusions of gas and/or liquid trapped during crystal growth. Can be found in rocks of all geological ages.

Uses & applications

Used in glassmaking, ceramics, electronics (as oscillators due to piezoelectricity), as an abrasive, and frequently by collectors and spiritual practitioners.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz and can often contain traces of gold in hydrothermal vein deposits.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and white, cloudy appearance. Commonly found in mountain ranges, stream beds, and pegmatites worldwide.