mineral

Quartz (Vein Quartz / Milky Quartz)

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Mohs hardness of 7. Color ranges from milky white to translucent pinkish-tan due to iron staining and micro-inclusions. Vitreous to greasy luster, hexagonal crystal system, uneven to conchoidal fracture, no cleavage, specific gravity of 2.65.

Identified July 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed via hydrothermal activity where silica-rich fluids cooled and crystallized within fractures and veins inside surrounding igneous or metamorphic rocks over millions of years.

Uses & applications

Used in glassmaking, ceramics, abrasives, electronics (piezoelectric applications), landscaping, and as decorative specimen for collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is completely transparent, but microscopic gas or liquid bubbles trapped during growth give milky quartz its cloudy appearance.

Field identification & locations

Identified by its high hardness (scratches glass and steel), lack of cleavage, milky to glassy appearance, and conchoidal fracture. Extremely common worldwide in gravel beds, rivers, pegmatites, and mountain veins.