The Collaborative International Dictionary of English v.0.48:

Sassolin \Sas"so*lin\, Sassoline \Sas"so*line\, n. [From Sasso,
   a town in Italy: cf. F. sassolin.] (Min.)
   Native boric acid, found in saline incrustations on the
   borders of hot springs near Sasso, in the territory of
   Florence.
   [1913 Webster] Sassorol