mineral

Druzy Quartz (on Chalcedony/Agate base)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Brownish-tan with clear crystals; Luster: Vitreous/sparkly; Crystal system: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: Brownish-tan with clear crystals
Luster: Vitreous/sparkly

Identified April 6, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Brownish-tan with clear crystals; Luster: Vitreous/sparkly; Crystal system: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Formation & geological history

Formed through hydrothermal precipitation where silica-rich fluids deposit tiny crystals in rock cavities or fractures. Typically found in volcanic vugs or sedimentary geodes.

Uses & applications

Primarily used in jewelry (pendants and rings) and by mineral collectors for its aesthetic sparkle.

Geological facts

The term 'druzy' (or druse) refers to a coating of fine crystals on a rock surface. This specific specimen appears to be a druzy coating over a chalcedony or agate base, giving it a 'sugar-coated' appearance.

Field identification & locations

Identify in the field by its distinct sparkle under light and high hardness (it will scratch glass). Often found in areas with past volcanic activity or in limestone deposits.

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