How abundant is sodium in Earth’s crust?

Sodium is the sixth most abundant element on Earth, making up approximately 2.6 to 2.8 percent of Earth’s crust.12

Because it is extremely reactive, sodium is never found in its free elemental state in the crust; instead, it occurs in nature as a constituent of various chemical compounds and minerals. It is a key component of silicate materials, such as feldspars and micas, and is found abundantly in halite (sodium chloride).132