mineral

Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white or colorless, vitreous luster, hexagonal crystal system, conchoidal fracture, specific gravity of 2.65.

Identified July 31, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, typically white or colorless, vitreous luster, hexagonal crystal system, conchoidal fracture, specific gravity of 2.65.

Formation & geological history

Formed in a wide variety of geological environments including igneous, metamorphic, and sedimentary rocks, often crystallized from silica-rich hydrothermal solutions or cooling magma.

Uses & applications

Used in electronics, glassware, precision instruments, countertops, abrasive materials, and gemstone jewelry.

Geological facts

Quartz is one of the most abundant and widely distributed minerals found on Earth's continental crust. Its piezoelectric properties make it invaluable in electronic timing and frequency control.

Field identification & locations

Easily identified by its hardness (scratches glass), lack of cleavage, and vitreous luster. Found worldwide in nearly every type of geological terrain.