mineral
Milky Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Cloudy white to pale yellow; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Cloudy white to pale yellow
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Cloudy white to pale yellow; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
Formation & geological history
Forms in hydrothermal veins, pegmatites, and as a primary constituent in igneous rocks like granite. The milky appearance is caused by microscopic inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in glassmaking, as an abrasive, in electronics (piezoelectric properties), as decorative gravel, and as a source of silicon metal.
Geological facts
Quartz is one of the most abundant minerals in Earth's crust. Milky quartz specifically gets its color from tiny fluid inclusions that scatter light, similar to how water droplets create fog.
Field identification & locations
Identify in the field by its hardness (will scratch glass), lack of cleavage, and translucent 'milky' appearance. Found worldwide in nearly every geological environment.
