mineral
Quartz Geode
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness 7; colorless, white, or grey; vitreous luster; trigonal crystal system; specific gravity 2.65.
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Physical properties
Mohs hardness 7; colorless, white, or grey; vitreous luster; trigonal crystal system; specific gravity 2.65.
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 as decorative display pieces, in lapidary arts, and for metaphysical purposes.
Geological facts
Geodes appear as ordinary bumpy spheres on the outside, but cracking them open reveals glittering crystal linings.
Field identification & locations
Look for rounded, nodular rocks with a bumpy exterior texture in limestone or volcanic formations; tap with a hammer to reveal the crystal cavity.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous