mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Colorless to white; Luster: Vitreous; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Colorless to white
- Luster
- Vitreous
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Physical properties
Hardness: 7 on Mohs scale; Color: Colorless to white; Luster: Vitreous; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
Formation & geological history
Formed when minerals precipitate from hydrothermal fluids into hollow cavities within sedimentary or volcanic rocks. Usually found in limestone or volcanic ash beds.
Uses & applications
Commonly used as decorative specimens, for educational purposes, in crystal healing practices, and as a popular entry-level item for rock collectors.
Geological facts
Geodes are often indistinguishable from ordinary rocks on the outside; their hollow, crystal-filled interiors are only revealed once they are cracked open.
Field identification & locations
Identified by a lumpy, cauliflower-like exterior and a hollow center containing visible crystals. Commonly found in desert regions or areas with limestone bedrock.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
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