mineral

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 on Mohs scale; Color: Colorless/Transparent; Luster: Vitreous (glass-like); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless/Transparent
Luster: Vitreous (glass-like)

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Colorless/Transparent; Luster: Vitreous (glass-like); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the cooling of silica-rich magma or precipitation from hydrothermal veins. It occurs in a wide variety of geological environments and ages, from ancient Precambrian formations to more recent volcanic activity.

Uses & applications

Extensively used in electronics (oscillators), optics, glassmaking, and industrial abrasives. In jewelry, it is used for beads, carvings, and as a semi-precious gemstone. Highly popular in mineral collecting and metaphysical practices.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It exhibits piezoelectric properties, meaning it can generate an electric charge when mechanical stress is applied. The term 'crystal' comes from the Greek 'krystallos', meaning ice.

Field identification & locations

Identify in the field by its 6-sided hexagonal prism shape and its ability to scratch glass easily. It will not react to acid. Found globally, with major high-quality deposits in Brazil, Arkansas (USA), and Madagascar.

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