mineral
Milky Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: White to opaque white; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- White to opaque white
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: White to opaque white; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Forms in hydrothermal veins or as a primary constituent of many igneous and metamorphic rocks. The cloudy appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in glass manufacturing, as an abrasive, in electronic oscillators (if high purity), landscaping, and as a collector's specimen.
Geological facts
Milky quartz is the most common variety of crystalline quartz. It can sometimes contain trace amounts of gold within its structure in specific geological mining districts.
Field identification & locations
Identify in the field by its hardness (will scratch glass), lack of cleavage, and white 'milky' appearance. It is found globally and is highly resistant to chemical and physical weathering.
