Featured News. Greens Sand has been in the silica sand industry since 1979 and has been a distributor of specialised silica sand to the Industrial as well as Leisure market for over 30 years, distributing nationally and across borders. We store a wide range of grades of silica sands.
Standing almost due east of the Reflecting Pool and the Lincoln Memorial, the monument, made of marble, granite, and bluestone gneiss, is both the world's tallest stone structure and the world's tallest obelisk, standing 555 feet 7 11â32 inches (169.351 m) tall.t the time of its completion, it was the tallest building in the world, a title it retained until the Eiffel Tower was completed in 1889; however, the Washington Monument is still the tallest stone structure in the world.
One thing for sure, however: there are no cracks at the very top of the monument. For the tip of the Washington Monument was made of aluminum, and it was made in Philadelphia. The movement for a monument to George Washington began in Philadelphia.On February 22, 1833, a cornerstone for a monument was laid in the center of Washington Square, but the endeavor was not continued.n November 12, 1884, Frishmuthâs Kensington foundry cast the aluminum tip of the Washington Monument. Considered a major technological achievement in its day, this 100-ounce pyramid was made of South Carolina Corundum and was the worldâs first large aluminum casting.