igneous
Quartz Vein Rock
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 on Mohs scale; Color: Milky white to tan; Luster: Vitreous to greasy; Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Milky white to tan
- Luster
- Vitreous to greasy
Identified More igneous →
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to tan; Luster: Vitreous to greasy; Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
Formation & geological history
Formed from hydrothermal solutions or pegmatitic activity. As fluids rich in silica cool within rock fractures, quartz crystals precipitate to form veins. These can date back billions of years depending on the host rock.
Uses & applications
Used in glass manufacturing, electronics (due to piezoelectric properties), construction as aggregate, and source of silicon metal. Smaller specimens are common for beginner collectors.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Vein quartz often acts as a 'host' for precious metals like gold in hydrothermal gold deposits.
Field identification & locations
Identify by its hardness (will scratch glass), milky white appearance, and lack of cleavage. Commonly found in mountainous regions, riverbeds, and construction sites worldwide.
