mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: White to translucent with yellowish iron staining; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- White to translucent with yellowish iron staining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: White to translucent with yellowish iron staining; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed as secondary minerals in hollow cavities within volcanic or sedimentary rocks. Silica-rich water precipitates crystals over long geological periods.
Uses & applications
Primarily used for geological education, lapidary practice, decorative collections, and metaphysical purposes.
Geological facts
The word geode is derived from the Greek word 'Geoides' meaning earth-like. They often look like ordinary rocks on the outside but contain hollow crystalline interiors.
Field identification & locations
Identify by looking for a vug or cavity lined with crystals. Common in riverbeds and limestone regions. A streak test will produce no color, and the specimen will scratch glass easily.
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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