mineral
Quartz Geode
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: White, colorless, or smoky; Luster: Vitreous; Crystal structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- White, colorless, or smoky
- Luster
- Vitreous
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Physical properties
Hardness: 7 (Mohs scale); Color: White, colorless, or smoky; Luster: Vitreous; Crystal structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed in cavities within sedimentary or volcanic rocks. Mineral-rich groundwater seeps into hollow spaces (vugs) and precipitates crystals over millions of years.
Uses & applications
Primarily used for mineral collecting, home decor, and spiritual/metaphysical purposes. Industrial quartz is used in electronics and glassmaking.
Geological facts
Geodes are essentially 'petrified bubbles.' While the exterior looks like an ordinary rock, the interior reveals a hollow cavity lined with sparkling crystals.
Field identification & locations
Identify in the field by looking for rounded, bumpy stones that feel lighter than they look (indicating a hollow center). Common in areas with limestone or volcanic ash layers.
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