mineral

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

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

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

Identified February 9, 2026More mineral →

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Physical properties

Hardness: 7 (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 in various geological environments, most commonly from the cooling of silica-rich magma or through hydrothermal activity in veins and geodes. It can be found in igneous, metamorphic, and sedimentary rocks across all geological ages.

Uses & applications

Extensively used in electronics (oscillators), manufacturing of glass and ceramics, jewelry, and as decorative collector specimens. It is also highly popular in holistic and metaphysical practices.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is traditionally called rock crystal. It displays piezoelectricity, meaning it generates an electric charge when mechanical stress is applied.

Field identification & locations

Identified in the field by its hardness (scratches glass), six-sided prismatic habit with striations often visible on crystal faces, and lack of cleavage. Common locations include Brazil, Arkansas (USA), and the Alps.

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