sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, transparent to white color, vitreous to sugary luster, hexagonal crystal system, and conchoidal fracture.
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Physical properties
Hardness of 7 on Mohs scale, transparent to white color, vitreous to sugary luster, hexagonal crystal system, and conchoidal fracture.
Formation & geological history
Formed when mineral-rich groundwater deposits silica inside hollow cavities of sedimentary or volcanic rocks over millions of years.
Uses & applications
Used primarily as decorative specimens, in crystal healing, and as polished collector display pieces.
Geological facts
Geodes start as simple bubbles in volcanic rock or animal burrows in mud, slowly growing sparkling crystal linings as water evaporates.
Field identification & locations
Identified by a hard outer nodular shell enclosing a sparkling central cavity of interlocking quartz crystals; commonly found in limestone formations worldwide.
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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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