mineral

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

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

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

Identified March 22, 2026More mineral →

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Physical properties

Formation & geological history

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

Uses & applications

Used in glassmaking, abrasives, and as a source of silicon for electronics. In jewelry, it is used for beads and cabochons. Frequently used in landscaping and as a common collector's starter specimen.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of crystalline quartz found in nature. High-purity quartz is essential for manufacturing semiconductors.

Field identification & locations

Identify by its ability to scratch glass (hardness 7) and its lack of cleavage (it breaks in irregular, shell-like curves). Commonly found in mountain ranges, riverbeds, and as veins in other rocks. Look for the white color and glassy luster.