mineral

Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Typically white, milky, or colorless; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None, exhibits conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Typically white, milky, or colorless
Luster: Vitreous to greasy

Identified August 5, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Typically white, milky, or colorless; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None, exhibits conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed in a wide variety of geological environments, commonly precipitating from hydrothermal veins, igneous pegmatites, and as detrital grains in sedimentary rocks over millions of years.

Uses & applications

Used in glassmaking, electronics, oscillators, abrasives, gemstones, and decorative items.

Geological facts

Quartz is one of the most abundant minerals in Earth's continental crust and exhibits piezoelectric properties, meaning it generates an electric charge in response to applied mechanical stress.

Field identification & locations

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