sedimentary
Sandstone concretion
Sedimentary concretion
AI-generated identification · may be incorrectHardness varies from 5 to 7 depending on cement; colors range from gray to brown; dull earthy luster; amorphous crystalline structure with quartz grains.
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Physical properties
Hardness varies from 5 to 7 depending on cement; colors range from gray to brown; dull earthy luster; amorphous crystalline structure with quartz grains.
Formation & geological history
Formed by the precipitation of mineral cement within the spaces between sediment grains, often growing around a nucleus over long geological periods.
Uses & applications
Used primarily as educational geological specimens, curiosities, or in landscaping.
Geological facts
These unusual shapes often lead people to mistake them for fossils, artifacts, or meteorites.
Field identification & locations
Found globally in sedimentary rock layers; collectors often search riverbeds and eroding cliffs where they weather out.
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