mineral

Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white, clear, or milky with a vitreous to greasy luster, hexagonal crystal system, and exhibits conchoidal fracture with no true cleavage.

Identified July 29, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, typically white, clear, or milky with a vitreous to greasy luster, hexagonal crystal system, and exhibits conchoidal fracture with no true cleavage.

Formation & geological history

Formed in a wide variety of environments including igneous, metamorphic, and sedimentary rocks, frequently precipitating from hydrothermal veins or crystallizing from silica-rich magmas.

Uses & applications

Used in electronics, oscillators, glassmaking, abrasives, and as a semi-precious gemstone in jewelry and ornamentation.

Geological facts

Quartz is one of the most abundant and widely distributed minerals found on Earth's continental crust, known for its piezoelectric properties.

Field identification & locations

Easily identified by its high hardness (scratches glass), lack of cleavage, and conchoidal fracture. Found worldwide in nearly every geological setting.