mineral

Clear Quartz

Silicon dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Colorless to white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless to white
Luster: Vitreous (glassy)

Identified June 27, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Colorless to white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the crystallization of magma or hydrothermal activity in various environments including pegmatites and metamorphic veins. It can be found in rocks from nearly all geological ages.

Uses & applications

Used in electronics for its piezoelectric properties, glassmaking, abrasives, jewelry (as semi-precious gemstones), and as a popular healing or decorative crystal for collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Historically, it was believed by ancient Greeks to be ice that had frozen so hard it would never melt, hence the name 'krystallos' (ice).

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and glassy appearance. It is found globally, notably in Brazil, Arkansas (USA), and Madagascar. Look for distinct six-sided prism crystals.