mineral

Quartz Druzy (on Calcedony/Quartz base)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Clear to milky white; Luster: Vitreous/Glassy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Clear to milky white
Luster: Vitreous/Glassy

Identified March 17, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Clear to milky white; Luster: Vitreous/Glassy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed through hydrothermal precipitation as silica-rich fluids cool and crystallize within cavities (vugs) or geodes in igneous or sedimentary host rocks. Most specimens are from the Cenozoic era or older.

Uses & applications

Used primarily in lapidary work for jewelry (pendants and rings), metaphysical collecting, and as decorative display specimens. High-purity quartz is used industrially in glass making and electronics.

Geological facts

The word 'druzy' (or druse) refers to a coating of fine crystals on a rock surface. Quartz is the most common mineral on Earth's continental crust and is piezo-electric, meaning it generates an electric charge when mechanical stress is applied.

Field identification & locations

Identify in the field by its characteristic 'sugar-like' sparkle under light and its ability to scratch glass (hardness test). Common locations include Brazil, Uruguay, and various parts of the United States (like Arizona or Missouri).

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