mineral
Quartz Geode fragment
Crystalline Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: white to off-white with yellowish iron staining; Luster: Vitreous to waxy; Hexagonal crystal structure; Conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- white to off-white with yellowish iron staining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: white to off-white with yellowish iron staining; Luster: Vitreous to waxy; Hexagonal crystal structure; Conchoidal fracture.
Formation & geological history
Formed via precipitation of silica-rich hydrothermal fluids or groundwater within cavities of igneous or sedimentary rocks. The hollow center indicates it was part of a larger geode nodule.
Uses & applications
Used primarily for education, hobbyist collecting, and decorative lapidary work. Quartz in general is vital for electronics and glassmaking.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Geodes are unique because they appear like plain rocks on the outside but contain hollow crystal-lined interiors.
Field identification & locations
Identified by its crystal habit inside a cavity, hardness (cannot be scratched by steel), and lack of cleavage. Common in desert environments and limestone regions.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
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sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
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Mineral
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