mineral
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, transparent to white color, vitreous luster, hexagonal crystal system, and no cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, transparent to white color, vitreous luster, hexagonal crystal system, and no cleavage.
Formation & geological history
Formed in hollow cavities of volcanic or sedimentary rocks through the slow precipitation of mineral-rich groundwater over millions of years.
Uses & applications
Widely used in jewelry, decorative items, electronics, and lapidary collections.
Geological facts
Geodes start as gas bubbles in lava or animal burrows in sediment that slowly fill with silica-rich water to form crystal linings.
Field identification & locations
Easily identified by its outer rock shell lined with sparkling inner quartz crystals; found globally, notably in Brazil, Mexico, and the USA.
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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