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Sandstone from White House

Potomac Formation. A microscope photo of the sandstone reveals that it contains too much clay to be very durable. It also has other flaws (not visible here) that can cause big problems for a building stone: isolated large pebbles and clay lumps, and uncemented areas.

Group: Sedimentary
Image Number: 2002-21820
Catalog Number: 113606
Gift of Architect of the Capitol , 1976
Locality: Aquia Creek , Virginia


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Smithsonian National Museum of Natural History Department of Mineral Sciences website Credits