mineral

Quartz Geode

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Mohs hardness 7, transparent to translucent white/colorless crystals, vitreous (glassy) luster, trigonal crystal system, conchoidal fracture, specific gravity 2.65

Identified July 27, 2026More mineral →

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Physical properties

Mohs hardness 7, transparent to translucent white/colorless crystals, vitreous (glassy) luster, trigonal crystal system, conchoidal fracture, specific gravity 2.65

Formation & geological history

Formed in cavities within sedimentary or volcanic rocks where silica-rich groundwater gradually precipitates quartz crystals over thousands to millions of years.

Uses & applications

Popular for display specimens, lapidary projects, crystal healing collections, educational gifts, and jewelry.

Geological facts

Geodes look like ordinary, unremarkable stones on the outside, but when cracked open, they reveal a hollow cavity lined with sparking crystals.

Field identification & locations

Identify by its round outer shell and hollow interior lined with sharp, pointed quartz crystal terminations that can scratch glass (hardness 7). Commonly found in Morocco, Mexico, Brazil, and the Midwestern US (Iowa, Illinois).