Philadelphia's University of Pennsylvania Museum of Archaeology and Anthropology (also called "Penn Museum" for short) displays the third largest crystal ball as the central object in its Chinese Rotunda. Weighing 49 pounds, the sphere is made of quartz crystal from Burma and was shaped through years of constant rotation in a semi-cylindrical container filled with emery, garnet powder, and water. The ornamental treasure was purportedly made for the Empress Dowager Cixi (1835-1908) during the Qing dynasty in the 19th century, but no evidence as to its actual origins exists.