sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 7, white or clear crystalline appearance, vitreous to sugary luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65
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Physical properties
Mohs hardness of 7, white or clear crystalline appearance, vitreous to sugary luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65
Formation & geological history
Formed in cavities of sedimentary or volcanic rocks where silica-rich groundwater percolates and slowly precipitates quartz crystals over millions of years.
Uses & applications
Used in decorative display, crystal collecting, mineral specimens, and occasionally lapidary work.
Geological facts
Geodes appear as ordinary, unassuming spherical rocks on the outside, but cracking them open reveals a sparkling hollow interior lined with crystal formations.
Field identification & locations
Found worldwide, notably in regions with limestone deposits or volcanic ash beds such as Mexico, Brazil, and the Midwestern United States (e.g., Keokuk, Iowa).
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