mineral
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: Translucent to white crystals. Luster: Vitreous (glass-like). Crystal Structure: Trigonal. Cleavage: Indistinct. Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Translucent to white crystals
- Luster
- Vitreous (glass-like)
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Physical properties
Hardness: 7 on Mohs scale. Color: Translucent to white crystals. Luster: Vitreous (glass-like). Crystal Structure: Trigonal. Cleavage: Indistinct. Specific Gravity: 2.65.
Formation & geological history
Geodes form as hollow cavities in volcanic or sedimentary rocks. Over millions of years, mineral-rich water seeps into the hollow and precipitates crystals inward. Most common in desert regions or limestone beds.
Uses & applications
Primarily used for decorative purposes, crystal healing, educational specimens, and lapidary art including jewelry components.
Geological facts
The word 'geode' comes from the Greek word 'geodes' meaning earth-like. Unlike a vug, which is a cavity in a rock, a geode is a separate structure that can be removed from its host rock intact.
Field identification & locations
Identify by a rounded, bumpy exterior that feels lighter than a solid rock of the same size. Commonly found in Iowa (the state rock), Morocco, Brazil, and Mexico. Collectors look for unbroken nodules that sound hollow when tapped.
