mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

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

Identified March 1, 2026More mineral →

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Physical properties

Hardness: 7 on the 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 silica-rich magma or from hydrothermal veins. It is found in all types of geological environments and can be millions to billions of years old depending on the host rock.

Uses & applications

Used in electronics (as piezoelectric crystals), glassmaking, abrasives, and widely in jewelry 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 stress is applied.

Field identification & locations

Identify in the field by its ability to scratch glass (hardness 7) and its lack of cleavage. Commonly found globally, with major deposits in Brazil, Madagascar, and Arkansas (USA). For collectors, look for clarity and well-defined crystal faces.