mineral

Milky Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, cloudy, or colorless; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White, cloudy, or colorless
Luster: Vitreous to greasy

Identified April 20, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, cloudy, or colorless; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids cool in crustal fractures. It can be found in igneous, metamorphic, and sedimentary environments across all geological ages.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), construction aggregate, and as a semi-precious gemstone/ornamental stone.

Geological facts

Milky quartz gets its cloudy appearance from microscopic inclusions of fluids or gas trapped during the crystal's formation. It is one of the most abundant minerals on Earth's crust.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and translucent 'milky' look. It is often found in veins within granite or schist, and as smooth pebbles in riverbeds.