Quartz Vein Rock

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.

Identified on: 5/4/2026

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