mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: White to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- White to opaque
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: White to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Forms in hydrothermal veins or as a primary constituent in igneous rocks like granite. The white color is caused by microscopic inclusions of fluids or gas trapped during crystal growth.
Uses & applications
Used in glass manufacturing, electronics (as a source of silicon), jewelry, abrasives, and as a popular specimen for collectors.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of crystalline quartz found in nature.
Field identification & locations
Identify by its hardness (scratches glass), lack of cleavage, and white opaque appearance. It is found globally across all geological environments.
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