sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, transparent to translucent with a vitreous luster, and a trigonal crystal system.
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Physical properties
Hardness of 7 on the Mohs scale, transparent to translucent with a vitreous luster, and a trigonal crystal system.
Formation & geological history
Formed when mineral-rich groundwater deposits silica inside hollow cavities in sedimentary or volcanic rocks over millions of years.
Uses & applications
Used primarily in lapidary arts, mineral collecting, ornamental decor, and occasional jewelry making.
Geological facts
Geodes start as hollow bubbles in rock, gradually lining with crystals as water evaporates and leaves dissolved minerals behind.
Field identification & locations
Easily identified by their rounded, unassuming exterior that hides a sparkling crystal cavity when cracked open; commonly found in limestone formations worldwide.
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