mineral

Quartz (Druzy Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale; Color: Colorless to white/translucent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal/Trigonal (macro-crystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on the Mohs scale
Color: Colorless to white/translucent
Luster: Vitreous (glassy)

Identified March 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the precipitation of silica from hydrothermal fluids or groundwater within cavities of host rocks. This specific druzy form occurs when tiny crystals grow on the surface of a rock or within a geode. They can form over millions of years across most geological eras.

Uses & applications

Used widely in jewelry (rings, pendants), as decorative collector specimens, and in industrial applications for its piezoelectric properties (clocks, electronics). High-quality quartz is also used in the manufacture of glass and silicon wafers.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Druzy quartz specifically is prized for its 'sugar-like' sparkle, which is caused by the way hundreds of tiny crystal faces reflect light simultaneously.

Field identification & locations

Identify in the field by its ability to scratch glass or steel, its lack of cleavage, and its characteristic hexagonal crystal terminations if visible. Commonly found in quartz veins, pegmatites, and as the lining of geode cavities in sedimentary or volcanic regions.