mineral

Clear Quartz

Silicon Dioxide (SiO2)

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

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

Identified March 18, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from the cooling of silica-rich magma or through hydrothermal processes where silicon-rich solutions crystallize in cavities. Found in all types of geological environments and can date from the Precambrian to recent times.

Uses & applications

Used in electronics for its piezoelectric properties, glass manufacturing, abrasives, and widely in jewelry or as faceted gemstones. Common as a 'healing crystal' in metaphysical practices.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure clear quartz is known as 'Rock Crystal' and has been used since ancient times for carving ceremonial objects and 'crystal balls'.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. In the field, look for its glassy transparency and resistance to weathering. Found worldwide, with major commercial deposits in Brazil and Arkansas, USA.