mineral

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Colorless/Transparent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless/Transparent
Luster: Vitreous (glassy)

Identified April 8, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Colorless/Transparent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed from silica-rich hydrothermal solutions cooling in veins or from the crystallization of magma in igneous rocks; can also occur in metamorphic and sedimentary environments globally throughout geological history.

Uses & applications

Used extensively in electronics (piezoelectric oscillators), optics, glassmaking, jewelry, and as a popular specimen for collectors and metaphysical practitioners.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is piezoelectric, meaning it generates an electric charge in response to applied mechanical stress, which is why it is used in watches and radios.

Field identification & locations

Identify in the field by its hexagonal crystal habit, lack of cleavage, and ability to scratch glass. Found globally, with notable deposits in Brazil, Arkansas (USA), and the Alps.