mineral

Druzy Quartz Geode (Vug)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Clear to milky white with tan staining; Luster: Vitreous (glassy); Crystal Structure: Hexagonal/Trigonal; Cleavage: None; Specific Gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: Clear to milky white with tan staining
Luster: Vitreous (glassy)

Identified April 10, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Clear to milky white with tan staining; Luster: Vitreous (glassy); Crystal Structure: Hexagonal/Trigonal; Cleavage: None; Specific Gravity: 2.65.

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids seep into cavities (vugs) within volcanic or sedimentary host rocks. The crystals grow inward over thousands of years.

Uses & applications

Primarily used as decorative specimens, for jewelry (drusy cabochons), and by metaphysical collectors. Quartz is also vital in electronics for its piezoelectric properties.

Geological facts

The word 'druzy' refers to the glittering effect of tiny crystals coating a rock surface. These small crystals are often the last stage of mineral growth in a cavity.

Field identification & locations

Identify in the field by looking for rounded nodules or cavities in limestone or volcanic rock. They feel heavier than normal rocks and often have a distinctive 'rattle' if crystals are loose inside. Look for the sparkle of crystal faces when held to light.