mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Cloudy white to pale pink/lavender; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Cloudy white to pale pink/lavender
Luster: Vitreous to greasy

Identified May 31, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Cloudy white to pale pink/lavender; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Forms from the cooling of silica-rich hydrothermal veins or magma in igneous, metamorphic, and sedimentary environments. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as a gemstone or landscape stone. Often tumbled for decor.

Geological facts

Quartz is the most abundant mineral in Earth's continental crust. Milky quartz specifically gets its 'milkiness' from microscopic fluid inclusions trapped since the moment the crystal began to grow.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and translucent cloudy white appearance. Commonly found as rounded river pebbles or vein outcrops.