mineral
Quartz Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, color ranges from clear to white or grey with crystalline interiors, vitreous luster, hexagonal crystal system, no cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, color ranges from clear to white or grey with crystalline interiors, vitreous luster, hexagonal crystal system, no cleavage, specific gravity of 2.65.
Formation & geological history
Formed in hollow cavities in sedimentary or volcanic rocks where silica-rich groundwater percolates and slowly precipitates quartz crystals over thousands to millions of years.
Uses & applications
Used in crystal collecting, decorative display pieces, and occasionally lapidary arts.
Geological facts
Geodes appear as ordinary, unassuming rocks on the outside, but cracking them open reveals a stunning, sparkling interior of crystal formations.
Field identification & locations
Can be identified in the field by their roughly spherical or nodular shape, bumpy weathered exterior, and a hollow sound or lighter weight compared to solid rocks of similar size.
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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