What are the characteristics of the raw materials of Xiangshan Hotel designed by I.M. Pei?

For the first time in Pei's architectural career, the design of Xiangshan Hotel is not based on reinforced concrete glass, and the materials used are traditional bricks and tiles. In the design of the whole hotel, the principle of high harmony and unity between the beauty of natural environment and the beauty of architectural art has always been implemented. I.M. Pei won the annual award of American Institute of Architects for this design.