sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Clear to white crystals; Luster: Vitreous/glassy; Crystal Structure: Hexagonal crystals; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Clear to white crystals
- Luster
- Vitreous/glassy
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Physical properties
Hardness: 7 on Mohs scale; Color: Clear to white crystals; Luster: Vitreous/glassy; Crystal Structure: Hexagonal crystals; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
Formation & geological history
Formed in hollow cavities of sedimentary rocks through the precipitation of minerals from hydrothermal fluids or groundwater over thousands to millions of years.
Uses & applications
Primarily used as decorative specimens, for educational purposes, in jewelry (when sliced), and by crystal collectors for aesthetic value.
Geological facts
The word 'geode' comes from the Greek word 'geodes', meaning earth-like. They look like ordinary round stones from the outside but contain hollow, crystal-lined interiors.
Field identification & locations
Identify by their rounded shape and lightness compared to solid rocks of the same size. A hollow sound when tapped can indicate a geode. Commonly found in deserts or limestone-rich areas.
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