mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Clear to milky white/pale grey crystals surrounded by a tan or beige host matrix. Luster: Vitreous to glassy. Crystal structure: Hexagonal/Trigonal. Cleavage: None (conchoidal fracture). Specific gravity: ~2.65.
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous to glassy
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Physical properties
Hardness: 7 on Mohs scale. Color: Clear to milky white/pale grey crystals surrounded by a tan or beige host matrix. Luster: Vitreous to glassy. Crystal structure: Hexagonal/Trigonal. Cleavage: None (conchoidal fracture). Specific gravity: ~2.65.
Formation & geological history
Forms inside hollow cavities in sedimentary or volcanic rock when mineral-rich water precipitates quartz crystals over extended periods of time.
Uses & applications
Popular among mineral collectors, used in ornamental displays, crystal healing practices, and gemstone crafting.
Geological facts
Geodes appear as ordinary, rough stones on the outside, but breaking them open reveals a sparkling inner cavity lined with mineral crystals such as quartz, amethyst, or chalcedony.
Field identification & locations
Identified by a rough, rounded exterior shell contrasting with a hollow or semi-hollow interior covered in sparkling quartz crystal terminations. Commonly found in Brazil, Uruguay, Mexico, and regions of the United States like Iowa and Indiana.
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