mineral
Quartz Geode
Silicon Dioxide (SiO2)
Hardness: 7 Mohs; Color: White to colorless crystals in a tan/yellow outer crust; Luster: Vitreous (glassy) inside, earthy outside; Structure: Hexagonal crystals.
- Hardness
- 7 Mohs
- Color
- White to colorless crystals in a tan/yellow outer crust
- Luster
- Vitreous (glassy) inside, earthy outside
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Physical properties
Hardness: 7 Mohs; Color: White to colorless crystals in a tan/yellow outer crust; Luster: Vitreous (glassy) inside, earthy outside; Structure: Hexagonal crystals.
Formation & geological history
Formed as hollow cavities in sedimentary or volcanic rock that are filled with mineral-rich water over millions of years, leading to crystal growth.
Uses & applications
Primarily used for geological education, home decor, metaphysical collecting, and as a source of quartz for minor lapidary work.
Geological facts
The word geode comes from the Greek word 'Geoides' meaning earth-like. No two geodes are exactly alike inside.
Field identification & locations
Identify by their rounded, lumpy 'cauliflower' exterior and hollow center filled with crystals. Often found in desert regions or limestone beds.
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