mineral

Clear 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 20, 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 crystallization of magma or from hydrothermal veins. It can be found in igneous, metamorphic, and sedimentary environments worldwide, often dating back hundreds of millions of years depending on the host rock.

Uses & applications

Extensively used in electronics (oscillators), glassmaking, abrasive manufacturing, jewelry, and as decorative display specimens for collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Historically, the word 'crystal' comes from the Greek word 'krystallos', meaning ice, as ancient Greeks believed quartz was ice that had frozen so hard it would never melt.

Field identification & locations

Identify in the field by its ability to scratch glass (hardness), its transparency, and the lack of cleavage. Look for hexagonal prism shapes in vugs or veins. Common locations include Brazil, USA (Arkansas), and the Alps.