mineral

Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, color ranges from clear to white, yellow, or pink, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Identified August 1, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, color ranges from clear to white, yellow, or pink, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, 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 granites and sandstones, crystallizing from silica-rich hydrothermal solutions or cooling magma.

Uses & applications

Used in electronics, manufacturing of glass and ceramics, abrasive materials, gemstone carving, and decorative collectibles.

Geological facts

Quartz is one of the most abundant minerals found in the Earth's continental crust and exhibits piezoelectric properties, meaning it can generate an electrical charge when mechanical stress is applied.

Field identification & locations

Easily identifiable in the field by its hardness (scratches glass), lack of cleavage, and vitreous luster. Found worldwide in nearly every geological setting.