What materials were used to build the Guggenheim museum Bilbao?

The museum is constructed of a complex steel frame with sinuous stone, glass and titanium orthogonal and organic volumes.

The titanium cladding used is half a millimeter thick, each piece is unique and has been designed with the aid of a state-of-the-art 3D design computer programme. The volumes are linked by glass curtain walls for light transparency.

In some of the more curvacious and irregular exhibition spaces within the museum the floor is constructed of cement with curved and twisted walls.

Before Gehry chose to use titanium sheathing, 29 different materials including stainless steel, copper and aluminum were considered for use.

Hope this has answered your question, if not given you a small indication of the materials used.