mineral
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 7 on Mohs scale; color ranges from clear to white drusy crystals; vitreous/glassy luster; trigonal crystal system; no cleavage with conchoidal fracture; specific gravity ~2.65.
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Physical properties
Hardness 7 on Mohs scale; color ranges from clear to white drusy crystals; vitreous/glassy luster; trigonal crystal system; no cleavage with conchoidal fracture; specific gravity ~2.65.
Formation & geological history
Formed in cavities within volcanic or sedimentary rocks where mineral-rich water precipitates quartz micro-crystals over millions of years.
Uses & applications
Popular as decorative display specimens, educational items, lapidary projects, and collector pieces.
Geological facts
Geodes often look like ordinary, unremarkable rounded stones from the outside, but cracking them open reveals brilliant sparkling crystal cavities inside.
Field identification & locations
Identified by the rough chalcedony or limestone exterior shell with a hollow cavity lined with sparkling quartz druzy crystals. Common in Morocco, Brazil, Mexico, and the Midwestern United States.
