sedimentary
Geode
Silicon dioxide (Quartz/Chalcedony nodule)
AI-generated identification · may be incorrectHardness 7 on Mohs scale, dull exterior with crystalline interior, vitreous luster, conchoidal fracture, specific gravity 2.65.
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Physical properties
Hardness 7 on Mohs scale, dull exterior with crystalline interior, vitreous luster, conchoidal fracture, specific gravity 2.65.
Formation & geological history
Formed through groundwater mineral deposition inside hollow cavities of sedimentary or volcanic rocks over millions of years.
Uses & applications
Used primarily in lapidary arts, ornamental display, crystal collecting, and metaphysical practices.
Geological facts
Geodes start as hollow bubbles in rock where mineral-rich water slowly precipitates microcrystalline quartz layers.
Field identification & locations
Identify by a spherical, bumpy exterior that sounds hollow when tapped and reveals sparkling crystals when cracked open.
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