mineral
Quartz Geode
Silicon Dioxide (SiO2)
Hardness: 7; Color: White to colorless; Luster: Vitreous/glassy; Structure: Hexagonal crystals growing inward; Specific Gravity: 2.65.
- Hardness
- 7
- Color
- White to colorless
- Luster
- Vitreous/glassy
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Physical properties
Hardness: 7; Color: White to colorless; Luster: Vitreous/glassy; Structure: Hexagonal crystals growing inward; Specific Gravity: 2.65.
Formation & geological history
Formed when mineral-rich groundwater seeps into hollow cavities in sedimentary or volcanic rock, slowly precipitating crystals over millions of years.
Uses & applications
Decorative display pieces, metaphysical collecting, gemology education, and occasionally source material for industrial silica.
Geological facts
The word geode comes from the Greek word 'Geoides' meaning earth-like. No two geodes are exactly alike on the inside.
Field identification & locations
Identify in the field by looking for rounded, lumpy stones that feel unusually lightweight for their size; common in desert regions like Morocco, Mexico, and the Midwestern US.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
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Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous