mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 Mohs scale; Color: Milky white to translucent pale yellow; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 Mohs scale
Color: Milky white to translucent pale yellow
Luster: Vitreous to greasy

Identified July 19, 2026More mineral →

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Physical properties

Hardness: 7 Mohs scale; Color: Milky white to translucent pale yellow; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed in hydrothermal veins and pegmatites through the cooling of silica-rich fluids. This specimen appears water-worn or tumbled, likely sourced from a riverbed or beach environment.

Uses & applications

Used as a gemstone in tumbled form, in the manufacturing of glass and ceramics, and as a source of silicon for electronics. Highly valued in metaphysical circles.

Geological facts

The 'milky' appearance is caused by tiny fluid inclusions of gas and/or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identified by its white translucency and inability to be scratched by a steel knife. Common in gravel beds and mountain streams worldwide. Collectors look for pieces with high translucency.