sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, clear to white color, vitreous luster, hexagonal crystal system, no cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, clear to white color, vitreous luster, hexagonal crystal system, no cleavage, specific gravity of 2.65.
Formation & geological history
Formed when mineral-rich groundwater deposits silica inside hollow cavities in sedimentary or volcanic rock over millions of years.
Uses & applications
Used primarily in decorative items, lapidary arts, metaphysical practices, and mineral collections.
Geological facts
Geodes appear as ordinary, bumpy rocks on the outside but reveal dazzling crystalline structures when cracked open.
Field identification & locations
Identified by its spherical or nodular external shape with a sparkling quartz crystal lining inside; commonly found in limestone formations worldwide.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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