mineral

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

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

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

Identified June 30, 2026More mineral →

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Physical properties

Formation & geological history

Formed from hydrothermal fluids circulating through fractures in the earth's crust, often associated with igneous intrusions or metamorphic heat. Geological age varies by location, often millions of years old.

Uses & applications

Primary source of silica for glass manufacturing, electronics (piezoelectric properties), abrasives, and as a semi-precious gemstone in jewelry when high quality.

Geological facts

Quartz is the second most abundant mineral in the Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why it often remains as veins or pebbles while surrounding rock erodes.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. Look for the 'sugary' or glassy texture in cracks of darker host rocks. Found globally in mountainous or volcanic regions.