mineral

Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, color ranges from colorless/white to various shades of grey, vitreous luster, hexagonal crystal system, conchoidal fracture, specific gravity of 2.65.

Identified July 28, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, color ranges from colorless/white to various shades of grey, vitreous luster, hexagonal 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. Often crystallizes from silica-rich hydrothermal veins or magma.

Uses & applications

Used in electronics (oscillators), glassmaking, abrasives, gemstones, and construction materials.

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 identifiable by its high hardness (scratches glass), conchoidal fracture, and lack of cleavage. Found worldwide in virtually every type of geological environment.