mineral

Clear Quartz (Crystal Quartz)

Silicon Dioxide (SiO2)

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

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

Identified February 18, 2026More mineral →

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Physical properties

Hardness: 7 (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 in nearly all mineral environments, most commonly by hydrothermal activity from cooling silica-rich solutions or as a primary constituent of igneous rocks like granite. Its geological age can range from billions of years to relatively modern formations depending on the host rock.

Uses & applications

Extensively used in electronics (oscillators), optical instruments, glass manufacturing, abrasives, jewelry (semiprecious gemstones), and metaphysical collecting.

Geological facts

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

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage (breaks like glass into curved surfaces), and its crystal habit. Found globally, especially in mountain ranges, alluvial gravels, and riverbeds. Collectors should look for termination points and clarity.

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