mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale; Color: Milky white to light gray with possible iron stains (red/brown); Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on the Mohs scale
Luster: Vitreous to greasy

Identified March 17, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of magma or hydrothermal activity in veins. The white 'milky' color is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth. They are found across all geological ages.

Uses & applications

Used in the manufacturing of glass and ceramics, as an abrasive, in the production of silicon for electronics, as landscaping gravel, and as a collector's specimen.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz specifically is the most common variety of crystalline quartz. Historically, it has been used for stone tools and in various cultural talismans.

Field identification & locations

Identify in the field by its ability to scratch glass, its lack of cleavage, and its characteristic waxy or vitreous luster. It is commonly found in riverbeds, mountains, and as 'float' in soil globally. Look for the white, cloudy appearance and hard, sharp edges on broken faces.