mineral
Quartz Geode
Silicon Dioxide (SiO2)
Hardness of 7 on Mohs scale, clear to translucent white color, vitreous luster, trigonal crystal system lining a hollow interior cavity, no distinct cleavage, specific gravity around 2.65.
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Physical properties
Hardness of 7 on Mohs scale, clear to translucent white color, vitreous luster, trigonal crystal system lining a hollow interior cavity, no distinct cleavage, specific gravity around 2.65.
Formation & geological history
Formed inside gas bubbles in volcanic rocks or cavities in sedimentary rocks when silica-rich hydrothermal fluids precipitate quartz crystals over thousands to millions of years.
Uses & applications
Popular among mineral collectors, used in home decor, lapidary arts, metaphysical practices, and educational displays.
Geological facts
Geodes look like plain, non-descript round rocks from the outside, but cracking them open reveals a sparkling hollow cavern lined with crystals.
Field identification & locations
Identified by its rough chalcedonic or limestone shell surrounding a hollow, crystal-lined interior. Commonly found in Morocco, Brazil, Uruguay, and the Midwestern United States.
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