mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Identified April 4, 2026More mineral →

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Physical properties

Hardness: 7 on 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 cooling of silica-rich magma or precipitation from hydrothermal veins. The milky appearance is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, ceramics, abrasives, and as a source of silicon for electronics. Lower grade milky quartz is also used as decorative gravel in landscaping.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Ancient civilizations often believed quartz was permanently frozen ice that would never melt.

Field identification & locations

Identified in the field by its ability to scratch glass, its white color, and its lack of cleavage. It is found globally in igneous, metamorphic, and sedimentary environments.