mineral

Quartz Druzy (on Matrix)

Silicon Dioxide (SiO2)

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

Hardness: 7 (Mohs scale)
Color: Colorless to smoky/grey due to inclusions
Luster: Vitreous to greasy

Identified April 19, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids cooling in rock cavities or fractures. The 'druzy' effect occurs when small crystals coat the surface of another rock or mineral (the matrix).

Uses & applications

Predominantly used for lapidary work, jewelry (pendants and rings), and as decorative display specimens for collectors.

Geological facts

The word 'druse' comes from the German word 'Druse', which refers to a cluster of crystals in a rock cavity. This specimen appears to have 'smoky' or carbonaceous inclusions between the crystals.

Field identification & locations

Identify in the field by its high hardness (scratches glass), lack of cleavage, and the presence of small, sparkling crystal faces. Commonly found in most global geological environments containing silica-rich veins.