mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 on Mohs scale; Color: Opaque white to light gray; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Opaque white to light gray
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Opaque white to light gray; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed from the crystallization of silica-rich hydrothermal solutions in veins or as a late-stage mineral in igneous pegmatites. The 'milky' appearance is caused by tiny gas or liquid inclusions trapped during crystal growth.
Uses & applications
Used in glass making, as an abrasive, in the production of silicon, in landscaping, and as a collector's specimen. High-purity quartz is used in electronics and optics.
Geological facts
Quartz is the most abundant and widespread mineral on Earth's surface. Milky quartz is the most common variety of crystalline quartz.
Field identification & locations
Identify by its white color, ability to scratch glass (hardness 7), and lack of cleavage. Often found as large veins in igneous and metamorphic terrains worldwide.
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