mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: White to creamy; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- White to creamy
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: White to creamy; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
Formation & geological history
Formed from the cooling of silica-rich hydrothermal solutions or within igneous pegmatites. The white color is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative stone in landscaping or jewelry.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz found in nature.
Field identification & locations
Identify in the field by its hardness (scratches glass), lack of cleavage, and typical white 'cloudy' appearance. It is found globally in many geological environments including veins and riverbeds.
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