Bauxite is the primary ore of aluminum. It is a mixture of two to three minerals including Diaspore, Bibbsite, and or Boehmite. Bauxite is a secondary product resulting from the weathering, leaching, and alteration of aluminous rocks and minerals. Aluminum is the 3rd most abundant element in the Earth's crust.
This specimen consist of Diaspor and Boehmite, which has a pisolitic habit (rounded concreations).