mineral
Quartz Drusy (on Geode Fragment)
Crystalline Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Colorless to white/translucent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Colorless to white/translucent
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale; Color: Colorless to white/translucent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
Formation & geological history
Formed via hydrothermal activity where silica-rich fluids precipitate into cavities (vugs) within igneous or sedimentary rocks. The tiny crystals (drusy) often represent the final growth stage inside a geode.
Uses & applications
Primarily used in jewelry (as drusy pendants), as decorative display specimens for collectors, and in metaphysical practices.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Small-crystal druse like this is highly valued for its 'sugar-like' sparkle under direct light.
Field identification & locations
Identify by its hardness (will scratch glass), lack of reaction to acid, and hexagonal crystal terminations. Commonly found in Brazil, Morocco, and the Midwestern United States.
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