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.
Without minerals you could not put pen to paper. The writing tips of pens are made with a strong metal called tungsten which comes from wolframite and scheelite ores. Think about the properties of tungsten: Strong; Rigid; Impermeable; You can see why we make pen nibs from tungsten. Paper is usually made of wood pulp mixed with minerals like clays, mica, talc and baryte. Lead pencils do not contain lead. The 'lead' is made of a mixture of clay and a mineral called graphite - a form of carbon. Think about the properties of graphite: Soft ; Easily powdered ; Opaque (not see-through) You can see why we make pencils from graphite.