mineral/igneous

Quartz Vein in Granite

Crystalline Silicon Dioxide (SiO2) in Granitic Matrix

AI-generated identification · may be incorrect

Hardness: 7 (Mohs scale), Color: White to translucent (vein) and grey/pink (matrix), Luster: Vitreous to dull, Crystal structure: Hexagonal/Trigonal, Specific gravity: 2.65

Identified June 28, 2026More mineral/igneous →

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Physical properties

Hardness: 7 (Mohs scale), Color: White to translucent (vein) and grey/pink (matrix), Luster: Vitreous to dull, Crystal structure: Hexagonal/Trigonal, Specific gravity: 2.65

Formation & geological history

The quartz vein formed via hydrothermal processes where silica-rich fluids filled fractures in the older granitic host rock during late-stage magmatic cooling or tectonic activity. Found in Precambrian to Cenozoic geological environments.

Uses & applications

Industrial crystal for electronics, source of high-purity silica for glass, construction aggregate, and as a common target for gold prospecting since quartz veins often host precious metals.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. These veins are known as 'lode' deposits and are historically the primary source of hard-rock gold mining.

Field identification & locations

Identify by the distinct color contrast between the white vein and darker host rock, extreme hardness (scratches glass), and lack of cleavage. Found globally in mountainous and shield regions.