mineral

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) with host rock (often Schist or Basalt)

AI-generated identification · may be incorrect

Hardness: 7 (Mohs); Color: White to translucent milky white; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 (Mohs)
Color: White to translucent milky white
Luster: Vitreous to greasy

Identified June 30, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs); Color: White to translucent milky white; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed by hydrothermal activity where silica-rich hot fluids circulate through fractures in existing host rock, precipitating quartz as they cool. These often form in metamorphic or igneous environments during mountain-building events.

Uses & applications

Quartz is used in glassmaking, electronics (piezoelectric properties), abrasives, and as a gemstone (semi-precious). Large veins can be indicators for gold prospecting.

Geological facts

Quartz veins are often associated with 'lode' gold deposits. The white color in milky quartz is caused by tiny fluid inclusions of gas and/or liquid trapped during crystal growth.

Field identification & locations

Identify by its hardness (will scratch glass), white color contrast against darker host rock, and lack of cleavage. Common in mountainous regions and metamorphic terranes globally.