I was wrong................the white house........which he made as well...........is made out of brass............the capital out of silver.................




So it is not like the other stones..............but made out of brass.............according to wiki anyways.........




Bentley was commissioned by President George Washington to make the brass cornerstone used for the White House groundbreaking ceremony in 1792. A year later, Bentley made a silver cornerstone which was used for the United States Capitol.^[3][4]