Why is the Washington monument made from marble?

The Washington Monument is primarily made from marble to symbolize the enduring values of democracy and honor the legacy of George Washington. Marble, with its durability and aesthetic appeal, was chosen for its ability to withstand the test of time and weathering while providing a majestic appearance. Additionally, marble was readily available from quarries in the United States, allowing for a nationalistic touch in its construction. The use of this material reflects the architectural styles of the period and enhances the monument's significance as a tribute.