mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Clear to white; Luster: Vitreous/glassy; Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Clear to white
- Luster
- Vitreous/glassy
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Physical properties
Hardness: 7 on Mohs scale; Color: Clear to white; Luster: Vitreous/glassy; Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Forms in hydrothermal veins or as linings in cavities (geodes) when silica-rich fluids cool and crystallize over thousands of years.
Uses & applications
Used in ornamental jewelry, home decor, metaphysical collecting, and historically in glass-making or electronics.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Druzy refers to the tiny glittering crystals that form on the surface of another mineral.
Field identification & locations
Identify by its hardness (cannot be scratched by a steel knife) and the presence of tiny, light-reflecting crystal faces. Found worldwide, often in volcanic or sedimentary rock voids.
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