mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: White, cloudy; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal prisms); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- White, cloudy
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (Mohs scale); Color: White, cloudy; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal prisms); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
Formation & geological history
Forms in hydrothermal veins or as a major constituent of igneous rocks like granite. The cloudiness is caused by tiny liquid or gas inclusions trapped during crystal growth.
Uses & applications
Used in electronics for its piezoelectric properties, as an abrasive, and in glassmaking. Collectible for metaphysical use and decorative landscaping.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz found in nature.
Field identification & locations
Identify by its hardness (scratches glass), lack of cleavage, and white 'milky' appearance. Found worldwide in nearly every geological environment.
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