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 Main Menu > GeoGallery > Rocks > Sedimentary > Sandstone from White House 
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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 |
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