mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7.0 Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7
Color: White to translucent
Luster: Vitreous to greasy

Identified June 3, 2026More mineral →

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Physical properties

Hardness: 7.0 Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the cooling and crystallization of silica-rich hydrothermal fluids or magma in veins and pegmatites. It is ubiquitous in the Earth's crust across all geological ages.

Uses & applications

Used in glassmaking, abrasives, construction aggregates, electronics, and as a decorative stone in landscaping or lapidary arts.

Geological facts

The milky white color is caused by microscopic inclusions of gas or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and translucent white appearance. Common in gravel beds and mountain outcrops globally. Collectors look for pieces with distinct crystal faces.