mineral

Quartz Vein in Matrix

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent with brown iron staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent with brown iron staining
Luster: Vitreous to greasy

Identified June 19, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed through hydrothermal activity where silica-rich hot fluids precipitate in fractures of a host rock (matrix). These veins can form across many geological eras, often during mountain-building events.

Uses & applications

Used primarily as a source of silica for glassmaking, in electronics as oscillators, in construction as aggregate, and as a semi-precious gemstone in jewelry when high quality crystals are present.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Vein quartz is often the primary source of 'lode gold,' as gold particles frequently precipitate alongside the quartz.

Field identification & locations

Identify by its ability to scratch glass, lack of cleavage, and white/cloudy appearance. Commonly found in mountainous regions or areas with metamorphic history. Collectors look for iron staining or voids that might contain crystals.