mineral

Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, transparent to translucent, vitreous luster, hexagonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Identified July 30, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, transparent to translucent, vitreous luster, hexagonal 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. Commonly crystallizes from silica-rich hydrothermal veins and magma.

Uses & applications

Used in electronics, watches, glassmaking, abrasives, and as gemstones in jewelry.

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

Can be identified in the field by its high hardness (scratches glass), lack of cleavage, and distinct conchoidal fracture. Found worldwide in almost all rock types.