mineral

Quartz (Crystal)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: Colorless to whitish/grey, Luster: Vitreous (glass-like), Crystal Structure: Trigonal/Hexagonal, Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65

Identified June 27, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: Colorless to whitish/grey, Luster: Vitreous (glass-like), Crystal Structure: Trigonal/Hexagonal, Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65

Formation & geological history

Forms in all temperatures and environments, most commonly from the cooling of magma or by hydrothermal precipitation in veins and cavities.

Uses & applications

Widely used in electronics (oscillators), glass manufacturing, abrasives, jewelry (gemstones), and as a popular collector's mineral.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is piezoelectric, meaning it generates an electric charge when mechanical pressure is applied.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and conchoidal fracture. Found globally, especially in granite and sandstone regions.