mineral

Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: White, clear, or milky. Luster: Vitreous to greasy. Crystal Structure: Trigonal, hexagonal prism. Cleavage: None, exhibits conchoidal fracture. Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: White, clear, or milky
Luster: Vitreous to greasy

Identified August 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms in a wide variety of geological environments, most commonly as a primary component of igneous rocks like granite, in hydrothermal veins, and as detrital grains in sedimentary rocks. Can range in geological age from Precambrian to modern-day formations.

Uses & applications

Used in electronics (oscillators), glassmaking, abrasives, gemstones, and construction materials.

Geological facts

Quartz is one of the most abundant minerals in Earth's continental crust. It exhibits piezoelectric properties, meaning it can generate an electrical charge in response to mechanical stress.

Field identification & locations

Can be identified by its characteristic conchoidal fracture, lack of cleavage, and hardness of 7, which allows it to easily scratch glass. Found worldwide in almost every geological setting.