. "Ralph Pinder-Wilson (in Pinder-Wilson and Watson, p. 19; 1976, p. 122???for his role in jade scholarship, see Skelton 1991, p. 369, n. 15) was the first to point out jade???s reputation for such qualities, based on Biruni???s statement (p. 198) that these properties were an important reason for the wearing of jade fittings by the ???Turks.??? Extant scabbard slides of softer and more brittle stone" . . .