Yün-yang

From one of the turquois dealers in Si-ngan fu the information was given me that the turquoises traded there come from the prefecture of Yün-yang in Hu-pei Province, while another more especially point to the district of Chu-shan, situated in the same prefecture, as the place of production. The Imperial Geography (Ta Ts'ing i t'ung chi, Ch. 272),³ in the chapter dealing with Yün-yang fu, contains no allusion to this fact, and mentions in an enumeration of the mountains of the Chu-shan district only one producing stones, the Fan shi shan, deriving its name from the fan shi or alum formerly produced there.