mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: White to cloudy; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- White to cloudy
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (Mohs scale); Color: White to cloudy; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed from the cooling of silica-rich magma or hydrothermal veins. The white color is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used as an abrasive, in the production of glass and ceramics, as flux in smelting, and as decorative stone or landscaping material.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz found globally.
Field identification & locations
Identify in the field by its hardness (will scratch glass), lack of cleavage, and white 'milky' appearance. Commonly found in veins or as float in gravel/stream beds.
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