mineral

Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, hexagonal crystal system, specific gravity of 2.65, often clear, white, or tinted with various colors.

Identified August 1, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, hexagonal crystal system, specific gravity of 2.65, often clear, white, or tinted with various colors.

Formation & geological history

Forms in a wide variety of geological environments including igneous, metamorphic, and sedimentary rocks. Often crystallizes from silica-rich hydrothermal veins and pegmatites.

Uses & applications

Used extensively in electronics, glassmaking, abrasive materials, gemstone carving, and ornamental objects.

Geological facts

Quartz is one of the most abundant minerals found in the Earth's continental crust and exhibits strong piezoelectric properties, making it useful in watches and electronic devices.

Field identification & locations

Easily identified by its characteristic crystal habit, high hardness (scratches glass), and conchoidal fracture. Found worldwide in almost all types of geological formations.