sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale; color ranges from clear, white, to brownish due to impurities; vitreous to dull luster; trigonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale; color ranges from clear, white, to brownish due to impurities; vitreous to dull luster; trigonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.
Formation & geological history
Formed in cavities in sedimentary or volcanic rocks where silica-rich groundwater circulates and deposits quartz crystals over millions of years.
Uses & applications
Used in mineral collecting, ornamental display, lapidary arts, and sometimes in metaphysical practices.
Geological facts
Geodes appear as ordinary, unassuming rocks on the outside, but when cracked open, they reveal a dazzling hollow interior lined with sparkling crystals.
Field identification & locations
Commonly found in limestone formations, volcanic ash beds, and deserts worldwide. Collectors look for spherical, slightly bumpy rocks that sound hollow when tapped.
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