mineral
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, white to clear color, vitreous luster, hexagonal crystal system, and no cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, white to clear color, vitreous luster, hexagonal crystal system, and no cleavage.
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 widely in jewelry, ornamental decor, metaphysical practices, and as a popular specimen for mineral collectors.
Geological facts
Geodes start as gas bubbles in volcanic lava or animal burrows in sedimentary layers, slowly lining with sparkling quartz crystals.
Field identification & locations
Easily identified in the field by a dull, bumpy outer rock shell encasing a hollow interior filled with sparkling crystals; found globally, notably in Brazil and the US.
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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