mineral

Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white, milky, or colorless, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.

Identified July 30, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, typically white, milky, or colorless, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.

Formation & geological history

Forms in a wide variety of geological environments including igneous, metamorphic, and sedimentary rocks. It is a primary component of pegmatites and hydrothermal veins.

Uses & applications

Used in electronics, glassmaking, abrasives, gemstones, and decorative items.

Geological facts

Quartz is one of the most abundant and widely distributed minerals found on Earth's surface. It exhibits piezoelectric properties, meaning it can generate an electrical charge under mechanical stress.

Field identification & locations

Easily identified by its hardness (scratches glass), conchoidal fracture, and lack of cleavage. Found worldwide in nearly every type of geological setting.