mineral
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness 7, vitreous to dull luster, hexagonal crystal system (microcrystalline to coarse crystals), pale yellowish-brown to beige color, non-cleavable with conchoidal fracture.
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Physical properties
Mohs hardness 7, vitreous to dull luster, hexagonal crystal system (microcrystalline to coarse crystals), pale yellowish-brown to beige color, non-cleavable with conchoidal fracture.
Formation & geological history
Formed via hydrothermal precipitation or mineral-rich groundwater filling cavities in volcanic or sedimentary host rocks, crystallizing over millions of years.
Uses & applications
Used primarily for lapidary arts, decorative home displays, educational collections, and metaphysical crystal practices.
Geological facts
Geodes often look like ordinary, rough stones from the outside, but cracking them open reveals sparkling crystalline interiors. Iowa chose the geode as its state rock in 1967.
Field identification & locations
Identified by its bumpy, nodular exterior and sparkling crystalline surface texture. Commonly found in stream beds, limestone quarries, and desert environments worldwide.
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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