mineral
Quartz (Quartzite or Milky Quartz)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Milky white to translucent, light pink hue; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: ~2.65
- Hardness
- 7 on Mohs scale
- Color
- Milky white to translucent, light pink hue
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to translucent, light pink hue; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: ~2.65
Formation & geological history
Forms in igneous pegmatites, hydrothermal veins, and metamorphic rocks. It accumulates as silicon dioxide crystallizes as magma cools or from hot water solutions.
Uses & applications
Used widely in electronics, glassmaking, abrasives, jewelry, ornamental carvings, and as a popular specimen for mineral collectors.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. It exhibits piezoelectric properties, which allowed it to revolutionize timekeeping through quartz clocks.
Field identification & locations
Identify by its ability to scratch glass (hardness 7), lack of cleavage, milky appearance, and conchoidal fracture. Found worldwide in pegmatite veins and gravel beds.
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