sedimentary
Fossiliferous Nodular Sedimentary Rock
Sedimentary Concretion with Fossil Inclusion
AI-generated identification · may be incorrectHardness varies between 3 and 7 depending on mineral cement and inclusion type, typically brown to earthy tones with a dull luster and fine-grained amorphous crystal structure.
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Physical properties
Hardness varies between 3 and 7 depending on mineral cement and inclusion type, typically brown to earthy tones with a dull luster and fine-grained amorphous crystal structure.
Formation & geological history
Formed through the precipitation of mineral cement around a nucleus like a fossil within sedimentary layers over millions of years.
Uses & applications
Valued primarily as a geological specimen and educational fossil display piece.
Geological facts
Concretions often weather out of softer surrounding shales and mudstones due to their superior hardness, preserving delicate fossil structures inside.
Field identification & locations
Identify by its distinctive rounded or nodular shape and the presence of embedded fossil fragments; commonly found in sedimentary rock formations worldwide.
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