The Collaborative International Dictionary of English v.0.48:

Crystallology \Crys`tal*lol"o*gy\
   (kr[i^]s`tal*l[o^]l"[-o]*j[y^]), n. [Gr. kry`stallos crystal
   + -logy.]
   The science of the crystalline structure of inorganic bodies.
   [1913 Webster]