mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Hardness: 7 on Mohs scale
Color: Opaque white to translucent
Luster: Vitreous to greasy

Identified June 3, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. The white color is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth. Can be found in various geological ages ranging from Precambrian to recent.

Uses & applications

Used in glass manufacturing, as an abrasive, in the production of silicon metal, as a decorative gemstone, and in landscaping. Also has historical value as a tool stone for lithic reduction.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of crystalline quartz and gets its cloudy appearance from microscopic bubbles.

Field identification & locations

Identify by its ability to scratch glass, its lack of cleavage, and the cloudy translucent white appearance. It is commonly found in mountain ranges, stream beds, and beach sands worldwide.