Quartz Vein in Metamorphic Rock

Physical Properties

Hardness: 7 (quartz) vs 4-6 (host); Color: White, grey, and green; Luster: Vitreous to dull; Structure: Massive veins; Cleavage: None (conchoidal fracture).

Formation & Geological History

Formed through hydrothermal processes where silica-rich fluids filled fractures in a host rock during regional metamorphism. Often found in orogenic belts where tectonic pressure and heat are high.

Uses & Applications

Primarily used as a decorative specimen or landscaping material; larger deposits are mined for high-purity silica in industrial manufacturing.

Geological Facts

Quartz veins are often 'indicator' rocks for gold prospectors, as gold is frequently deposited by the same hydrothermal fluids that carry the silica.

Field Identification & Locations

Identify by looking for white, crystalline bands cutting through a darker, often foliated host rock. Extremely common in riverbeds and mountainous terrain.

Identified on: 5/3/2026

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