sedimentary
Geode Nodule Fragment
Quartz / Chalcedony Nodule
AI-generated identification · may be incorrectWhite to clear microcrystalline quartz interior, rough outer shell, hardness around 7 for the quartz part.
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Physical properties
White to clear microcrystalline quartz interior, rough outer shell, hardness around 7 for the quartz part.
Formation & geological history
Formed in sedimentary or volcanic rock cavities by mineral-rich water depositing silica.
Uses & applications
Collectible, decorative.
Geological facts
Geodes are essentially hollow rocks lined with crystals or other minerals.
Field identification & locations
Identified by the rough, often limestone or chalcedony exterior and crystalline or smooth chalcedony interior cavity.
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