mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 Mohs; Color: Opaque white to pale cream; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
- Hardness
- 7 Mohs
- Color
- Opaque white to pale cream
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 Mohs; Color: Opaque white to pale cream; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
Formation & geological history
Formed through the cooling of silica-rich magma or from hydrothermal veins. The cloudy milky white color is caused by microscopic inclusions of fluids or gas trapped during crystal growth.
Uses & applications
Used in construction as aggregate, as a source of silica for glass and electronics, and as decorative stone or ornamental carvings.
Geological facts
Milky Quartz is the most common variety of crystalline quartz. While often overlooked for clearer varieties, it can contain traces of gold in quartz vein deposits.
Field identification & locations
Identify in the field by its hardness (ability to scratch glass), its opaque white color, and its lack of cleavage. It is found globally in almost all geological environments.
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Metamorphic
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metamorphic
Gypsum (variety Selenite or Alabaster)
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Mineral/Rock
Granite
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