mineral

Clear Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale; Color: Colorless to transparent; Luster: Vitreous (glass-like); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on the Mohs scale
Color: Colorless to transparent
Luster: Vitreous (glass-like)

Identified March 18, 2026More mineral →

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Physical properties

Hardness: 7 on the Mohs scale; Color: Colorless to transparent; Luster: Vitreous (glass-like); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the cooling and crystallization of silica-rich magma or from hydrothermal solutions in veins. It is found in a wide variety of igneous, metamorphic, and sedimentary environments across all geological ages.

Uses & applications

Extensively used in electronics for its piezoelectric properties (oscillators), glassmaking, jewelry (faceted stones and beads), abrasive blasting, and as a popular specimen for metaphysical collectors.

Geological facts

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

Field identification & locations

Identify in the field by its ability to scratch glass, its lack of cleavage, and its transparent-to-cloudy appearance. It is found worldwide, with major high-quality deposits in Brazil, Arkansas (USA), and Madagascar. Look for its characteristic hexagonal crystal habits or tumbled water-worn pebbles in stream beds.