mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to cream with yellowish iron staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to cream with yellowish iron staining
Luster: Vitreous to greasy

Identified June 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal solutions in veins or as a constituent of igneous rocks like granite. The cloudy white appearance is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, electronics (due to piezoelectric properties), and as decorative masonry or landscape stone. Tumbled pieces are common in the gemstone and 'healing crystal' markets.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It can often be found in large veins that are visible across entire mountain faces. It often serves as a 'host rock' for gold in hydrothermal vein deposits.

Field identification & locations

Identify in the field by its ability to scratch glass, its lack of cleavage, and its characteristic waxy or glassy luster. Found globally in almost all geological environments, particularly in gravel beds and mountain outcrops.