mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 on Mohs scale; Color: Cloudy white to opaque; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Cloudy white to opaque
- Luster
- Vitreous (glassy) to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Cloudy white to opaque; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed through the cooling of silica-rich magma or from hydrothermal veins. The white color is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in glassmaking, abrasives, as a gemstone (cabochons), in the electronics industry for its piezoelectric properties, and as a common decorative stone in landscaping.
Geological facts
Milky quartz is the most common variety of crystalline quartz. Historically, it was often mistaken for white marble or quartzite by early miners.
Field identification & locations
Identify by its hardness (will scratch glass), lack of cleavage, and white cloudy appearance. Common in riverbeds and mountainous terrain worldwide.
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