mineral

Druzy Chalcedony (Agate Geode)

Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz

Hardness: 6.5-7 (Mohs scale), Color: Translucent white/gray, Luster: Waxy to vitreous (sparkling druzy), Crystal Structure: Trigonal/Hexagonal, Cleavage: None, Specific Gravity: 2.58-2.64

Hardness: 6

Identified June 9, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Translucent white/gray, Luster: Waxy to vitreous (sparkling druzy), Crystal Structure: Trigonal/Hexagonal, Cleavage: None, Specific Gravity: 2.58-2.64

Formation & geological history

Formed via secondary deposition of silica-rich fluids in volcanic rock cavities or sedimentary nodes. The outer layer is chalcedony (cryptocrystalline), while the inner druzy is macrocrystalline quartz.

Uses & applications

Commonly used in jewelry, as decorative focal points, metaphysical healing practices, and as collector specimens.

Geological facts

The term 'druzy' refers to the tiny glittering crystals that cover a host rock. This specimen has been carved and polished into a heart shape to highlight the natural cavity.

Field identification & locations

Identify by the sparkling 'sugar-like' crystals in the center and the smooth, waxy chalcedony border. Commonly found in Brazil, Uruguay, and India.

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