History
The earliest ''cong'' were produced by the Xuejiagang culture and the Liangzhu culture ( 3400– 2250 BC); later examples date mainly from the Shang and Zhou dynasties. Interest in the jade shape developed during the 12th–13th centuryDescription
A ''cong'' is a straight tube with a circular bore and square outer section with more or less convex sides. The outer surface is divided vertically or horizontally such that the whole defines a hollow cylinder embedded in a partial rectangular block. Proportions vary: a ''cong'' may be squat or taller than it is wide. The outer faces are sometimes decorated with mask-like faces, which may be related to the ''References
Further reading
*''Les jades néolithiques chinois'' / ontributions de Christophe Comentale, Laurent Long, Tong Peihua, Zhang Jingguo our l'ACI Du chopper au brilliant aris: Museum national d'histoire naturelle, cop. 2008, 1 vol. (81 p.) : ill., couv. ill.; 30 cm *''Art et archéologie : la Chine du Néolithique à la fin des Cinq Dynasties, 960 de notre ère'' / Danielle Elisseeff; Paris : École du Louvre : RMN, 2008 *"Neolithic Chinese Jades", Angus Forsyth, in ''Jade''. Ed. Roger Keverne. New York: Van Nostrand Reinhold, 1991. pp. 88–109.External links
*http://www.asia.si.edu/explore/china/jades/gallery.asp#cong *http://www.metmuseum.org/art/collection/search/72376 *https://www.britishmuseum.org/visiting/galleries/asia/room_33b_chinese_jade.aspx Archaeological artifacts of China Archaeological artefact types Chinese porcelain Chinese pottery Hardstone carving Pottery shapes Jade {{china-stub