mineral

Milky Quartz

Quartz (SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

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

Identified May 28, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed from the cooling of silica-rich magma or precipitation from hydrothermal veins. The milky appearance is caused by tiny liquid or gas inclusions trapped during crystal growth.

Uses & applications

Used in glass manufacturing, abrasives, gemstones, electronics (oscillators), and as a common decorative landscaping stone.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is often found in massive form rather than distinct crystals.

Field identification & locations

Identified in the field by its hardness (scratches glass), lack of cleavage, and white color. Found globally in igneous, metamorphic, and sedimentary environments.