mineral
Quartz Geode
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: Clear to white; Luster: Vitreous; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct; Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Clear to white
- Luster
- Vitreous
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Physical properties
Hardness: 7 (Mohs scale); Color: Clear to white; Luster: Vitreous; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct; Specific Gravity: 2.65
Formation & geological history
Formed by the precipitation of mineral-rich water within cavities of igneous or sedimentary rocks, often over millions of years as hydrothermal fluids deposit silica layers.
Uses & applications
Primarily used as decorative display specimens, for lapidary work, jewelry, and in metaphysical collecting.
Geological facts
Geodes are essentially hollow rocks with secret crystalline interiors. The term geode is derived from the Greek word 'Geoides' which means 'earth-like'.
Field identification & locations
Identify in the field by looking for rounded, bumpy, lighter-than-average rocks that sound hollow when tapped. Common in desert regions with volcanic history or limestone beds.
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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
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous