mineral

Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white, clear, or milky in color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, and specific gravity of 2.65.

Identified July 30, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, typically white, clear, or milky in color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, and 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 common constituent of pegmatites, hydrothermal veins, and sandstones.

Uses & applications

Used widely in electronics, glassmaking, abrasives, gemstones, and as a decorative stone in jewelry and carvings.

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 electric charge under mechanical stress.

Field identification & locations

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