mineral

Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, colorless or white, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Identified August 3, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, colorless or white, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Formation & geological history

Formed in a wide variety of geological environments, commonly crystallizing from silica-rich hydrothermal veins and magma, as well as precipitating in sedimentary environments.

Uses & applications

Used in electronics, oscillators, glassmaking, abrasives, and as decorative gemstone or collector specimens.

Geological facts

Quartz is one of the most abundant minerals in the Earth's continental crust and 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 rock formation.