mineral
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: White to translucent with tan/yellow center; Luster: Vitreous to sparkling; Crystal System: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture)
- Hardness
- 7 on Mohs scale
- Color
- White to translucent with tan/yellow center
- Luster
- Vitreous to sparkling
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Physical properties
Hardness: 7 on Mohs scale; Color: White to translucent with tan/yellow center; Luster: Vitreous to sparkling; Crystal System: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture)
Formation & geological history
Formed by the precipitation of mineral-rich water in a rock cavity, often within volcanic or sedimentary environments. Age can range from millions to hundreds of millions of years.
Uses & applications
Commonly used in jewelry, as decorative collector pieces, or for metaphysical belief practices. Higher quality druses are used in faceted designs or pendants.
Geological facts
The term 'druzy' refers to a coating of fine crystals on a rock surface. In many cases, these are the inner linings of small geodes that have broken open.
Field identification & locations
Identify by the characteristic 'sugar-like' sparkle on the surface and the hardness of the base material. Often found in stream beds or limestone outcrops in regions like the Midwest USA or Brazil.
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