mineral

Quartz

SiO2 (Silicon Dioxide)

Hardness: 7 (Mohs scale), Color: Clear, white, gray; Luster: Vitreous (glassy), Crystal structure: Trigonal, Cleavage: None (conchoidal fracture), Specific gravity: 2.65

Hardness: 7 (Mohs scale), Color: Clear, white, gray
Color: Clear, white, gray

Identified July 18, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: Clear, white, gray; Luster: Vitreous (glassy), Crystal structure: Trigonal, Cleavage: None (conchoidal fracture), Specific gravity: 2.65

Formation & geological history

Forms in igneous, metamorphic, and sedimentary rocks. Typically crystallizes from silica-rich magma or from hydrothermal veins.

Uses & applications

Used in glassmaking, electronics, watches, and as a gemstone or in jewelry.

Geological facts

Quartz is one of the most common minerals in the Earth's crust. It is piezoelectric, meaning it can generate an electrical charge when mechanical pressure is applied.

Field identification & locations

Can be identified by its hardness (scratches glass), glassy luster, and conchoidal fracture. Commonly found worldwide in various geological environments.