mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to greasy; Crystal structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Milky white to translucent
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to greasy; Crystal structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
Formation & geological history
Forms in hydrothermal veins or as a late-stage mineral in igneous pegmatites. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in glass making, electronics (piezoelectric properties), abrasives, and as decorative gravel or landscaping stone. Commonly collected by beginners.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz can sometimes contain microscopic grains of gold in hydrothermal veins.
Field identification & locations
Identify by its hardness (scratches glass), lack of cleavage, and waxy to vitreous luster. Found globally in riverbeds, mountains, and near volcanic sites.
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