mineral

Druzy Quartz on Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White to colorless (clear); Luster: Vitreous/glassy to adamantine (sparkly); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White to colorless (clear)
Luster: Vitreous/glassy to adamantine (sparkly)

Identified March 30, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids cool and crystallize inside rock cavities (geodes) or veins. They can form in various geological ages ranging from Precambrian to Cenozoic, commonly in volcanic or sedimentary environments.

Uses & applications

Used in the gemstone and jewelry industry for 'druzy' pendants and rings, ornamental decor, and as popular specimens for mineral collectors.

Geological facts

The term 'druzy' refers to a coating of fine crystals on a rock surface. Quartz is the most common mineral to form druzy, and its small faces act like tiny mirrors, giving it a characteristic 'sugar-like' sparkle.

Field identification & locations

Identify in the field by its hardness (will scratch glass), glassy luster, and the presence of tiny, repeating crystal terminations. Found globally, especially in basaltic regions or areas with high quartz concentrations. Collectors look for even coverage and high sparkle.

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