mineral
Quartz (Milky/Vein Quartz)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Milky white to light tan; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Milky white to light tan
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to light tan; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.
Formation & geological history
Formed from hydrothermal solutions or cooling magma in veins and pegmatites. This specimen likely weathered out of a hydrothermal vein before being tumbled by water/erosion.
Uses & applications
Used in glassmaking, abrasives, electronics (piezoelectric properties), construction aggregate, and as a common decorative collector stone.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Its 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Field identification & locations
Identify in the field by its hardness (will scratch glass), lack of cleavage, and translucent look. Commonly found in riverbeds, mountains, and gravel pits globally.
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mineral