mineral
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: Clear to white or translucent. Luster: Vitreous (glassy). Crystal Structure: Trigonal/Hexagonal quartz crystals lining a hollow cavity. Cleavage: None, exhibits conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- Clear to white or translucent
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale. Color: Clear to white or translucent. Luster: Vitreous (glassy). Crystal Structure: Trigonal/Hexagonal quartz crystals lining a hollow cavity. Cleavage: None, exhibits conchoidal fracture.
Formation & geological history
Formed in cavities within volcanic rocks or sedimentary deposits where silica-rich groundwater gradually precipitates quartz crystals over millions of years.
Uses & applications
Used in ornamental pieces, lapidary art, crystal display specimens, educational collections, and jewelry.
Geological facts
Geodes often look like ordinary, unremarkable rounded rocks on the outside, but contain brilliant crystal cavities when cracked or sliced open.
Field identification & locations
Identified by a rough exterior shell surrounding a hollow central cavity filled with sparkling, well-formed quartz crystals. Commonly found in regions with ancient volcanic activity such as Brazil, Uruguay, Morocco, and the Midwestern United States (e.g., Iowa).
