mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Milky white to translucent grey
Luster: Vitreous to greasy

Identified April 12, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the crystallization of silica-rich magma or from hydrothermal veins. It is found in almost all geological environments and can be from any geological age, often occurring as massive veins filling bedrock fractures.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), abrasives, construction aggregates, and as gemstones or ornamental carvings.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'Quarz', which likely has Slavic origins meaning 'hard'. It is the primary component of most beach sands.

Field identification & locations

Identify in the field by its ability to scratch glass, lack of cleavage, and conchoidal (shell-like) fracture patterns. It is found worldwide in mountains, riverbeds, and deserts.