sedimentary
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) with Quartz crystals
Hardness: 7 (crystals); Color: White to brownish/orange; Luster: Vitreous/sparkling; Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture.
- Hardness
- 7 (crystals)
- Color
- White to brownish/orange
- Luster
- Vitreous/sparkling
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Physical properties
Hardness: 7 (crystals); Color: White to brownish/orange; Luster: Vitreous/sparkling; Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed through hydrothermal precipitation or groundwater percolation where silica-rich fluids deposit tiny quartz crystals onto a host sedimentary rock, typically during late-stage mineralization in fissures or cavities.
Uses & applications
Commonly used for ornamental purposes, healing crystal collections, and sometimes in bohemian-style jewelry where the 'druzy' sparkle is featured.
Geological facts
The term 'druzy' refers to a coating of fine crystals on a rock surface; it takes millions of years for these tiny, glittery layers to crystallize perfectly from mineral-saturated water.
Field identification & locations
Identify by looking for a 'sugary' sparkling surface on a duller host rock. It is common in geode-rich areas like the American Midwest or Brazil.
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