mineral

Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white, pink, or colorless, vitreous luster, hexagonal crystal system, conchoidal fracture, specific gravity of 2.65.

Identified August 6, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, typically white, pink, or colorless, vitreous luster, hexagonal crystal system, conchoidal fracture, specific gravity of 2.65.

Formation & geological history

Formed in a wide variety of geological environments including igneous, metamorphic, and sedimentary rocks, often crystallizing from silica-rich hydrothermal solutions or magma.

Uses & applications

Used in electronics, watches, glassmaking, engineered stone countertops, and as decorative gemstones or aquarium decor.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust, surpassed only by feldspar. It exhibits piezoelectric properties, meaning it can generate an electrical charge in response to mechanical stress.

Field identification & locations

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