mineral
Quartz Geode (Water-worn)
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: White to translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture.
- Hardness
- 7 (Mohs scale)
- Color
- White to translucent
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: White to translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed in cavities (vugs) within volcanic or sedimentary rocks where silica-rich groundwater precipitates over long geological periods. This specimen has been rounded by fluvial or coastal transport.
Uses & applications
Commonly used for collecting, decorative purposes, and sometimes crushed for industrial silica glass production.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. This piece shows internal crystallization that has been exposed and smoothed by water erosion.
Field identification & locations
Identify by its hardness (will scratch glass), lack of reaction to acid, and crystalline structure within the cavities. Found globally in riverbeds and coastal regions.
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