The Collaborative International Dictionary of English v.0.48:

Halite \Ha"lite\ (h[=a]"l[imac]t or h[a^]l"[imac]t), n. [Gr.
   "a`ls salt.] (Min.)
   Native salt; sodium chloride.
   [1913 Webster]

WordNet (r) 3.0 (2006):

halite
    n 1: naturally occurring crystalline sodium chloride [syn:
         halite, rock salt]