mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 7 on Mohs scale; white to pinkish crystalline interior surrounded by a dark brownish-gray chalcedony or basalt shell; vitreous luster inside crystals; trigonal crystal system; no cleavage.
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Physical properties
Hardness 7 on Mohs scale; white to pinkish crystalline interior surrounded by a dark brownish-gray chalcedony or basalt shell; vitreous luster inside crystals; trigonal crystal system; no cleavage.
Formation & geological history
Formed in cavities within volcanic or sedimentary rocks where mineral-rich water precipitates quartz crystals inward over long periods.
Uses & applications
Used primarily as decorative mineral specimens, in jewelry, or for lapidary work and mineral collecting.
Geological facts
Geodes appear as ordinary, unremarkable round rocks on the outside, but breaking them open reveals a hollow cavity lined with sparkling mineral crystals.
Field identification & locations
Identify by its bumpy round exterior combined with a crystalline, hollow or solid quartz interior; widely found in volcanic ash beds and limestone formations.
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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
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary