mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Cloudy white to tan (due to iron inclusions); Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Cloudy white to tan (due to iron inclusions)
Luster: Vitreous to greasy

Identified March 29, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins or pegmatites when silica-rich fluids cool and crystallize. The 'milky' appearance is caused by microscopic inclusions of liquids or gases trapped during crystal growth. Can be found in rocks from nearly all geological ages.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), as an abrasive, in landscaping, and as a semi-precious stone in jewelry and metaphysical collecting.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of crystalline quartz. It is often found associated with gold in hydrothermal vein deposits.

Field identification & locations

Identify in the field by its ability to scratch glass, lack of cleavage, and white 'waxy' appearance. Commonly found in gravel pits, mountain streams, and near granite outcrops worldwide.