mineral

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Hardness: 7 on Mohs scale; Color: Colorless and transparent; Luster: Vitreous (glassy); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

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

Identified March 14, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Colorless and transparent; Luster: Vitreous (glassy); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Forms in igneous, metamorphic, and sedimentary environments through the cooling of silica-rich magma or from hydrothermal solutions. It can be found in rocks from nearly all geological ages.

Uses & applications

Extensively used in jewelry (beads, pendants), spiritual/metaphysical practices, glass manufacturing, and electronics due to its piezoelectric properties.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Historically, the Greeks believed clear quartz was deeply frozen ice that would never melt.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. Common locations include Brazil, Madagascar, and the United States (Arkansas). Collectors should look for internal clarity and absence of air bubbles (which would indicate glass).