mineral
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 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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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous