sedimentary
Geode with Quartz and Iron Oxide
Silicon dioxide with iron oxide inclusions (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous to dull luster, transparent to opaque, conchoidal fracture, and hexagonal crystal system visible in micro-crystals.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous to dull luster, transparent to opaque, conchoidal fracture, and hexagonal crystal system visible in micro-crystals.
Formation & geological history
Formed in sedimentary rock cavities where silica-rich groundwater precipitated microcrystalline quartz layers over millions of years.
Uses & applications
Popular in lapidary arts, mineral collecting, and home decor displays.
Geological facts
The metallic core visible inside the cavity is likely a nodule of hematite or goethite weathered from surrounding limestones.
Field identification & locations
Common in limestone and sedimentary formations globally, identifiable by its spherical exterior shell and crystalline interior cavity.
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