mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- White to translucent
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (Mohs scale); Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Forms in a wide variety of environments, most commonly from hydrothermal veins or cooling igneous magma. This specimen appears water-worn, likely found in a riverbed or coastal environment.
Uses & applications
Used extensively in glassmaking, electronics (piezoelectric properties), abrasives, and as a common gemstone/collectible.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its white color from tiny pocket inclusions of gas or liquid trapped during crystal growth.
Field identification & locations
Identify in the field by its inability to be scratched by a steel knife and its lack of cleavage planes. Found globally in almost all geological settings.
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