mineral

Druzy Quartz on Chalcedony Matrix

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Colorless to white/grey; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Colorless to white/grey
Luster: Vitreous to greasy

Identified May 16, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Colorless to white/grey; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed through the precipitation of silica-rich hydrothermal fluids in volcanic rock cavities or sedimentary geodes. The 'druzy' layer consists of tiny crystals that form many millions of years after the host rock.

Uses & applications

Primarily used in jewelry (pendants and rings) and as aesthetic collector specimens or metaphysical decorative items.

Geological facts

The term 'druzy' refers to the glittering effect of tiny crystals coating a rock surface. Quartz is the most common mineral to form druzy layers, often found lining the inside of geodes.

Field identification & locations

Identify by its 'sugar-like' sparkling surface and hardness (will scratch glass). Often found in basaltic lava flows or limestone beds. Best cleaning method for collectors is ultrasonic or mild soap and water.

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