mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: White to off-white/cream; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- White to off-white/cream
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (Mohs scale); Color: White to off-white/cream; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
Formation & geological history
Formed by the cooling of silica-rich hydrothermal fluids in veins or pegmatites. The milky appearance is caused by tiny inclusions of gas and liquid trapped during crystal growth.
Uses & applications
Used in glass making, as an abrasive, in electronics for its piezoelectric properties, and widely in landscaping and home decor.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz.
Field identification & locations
Identify by its white opaque color, lack of cleavage, and ability to scratch glass. Commonly found in mountains, riverbeds, and as veins within other rock types globally.
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