gypsiferous

From The Collaborative International Dictionary of English v.0.48:

Gypsiferous \Gyp*sif"er*ous\ (j[i^]p*s[i^]f"[~e]r*[u^]s), a.
   [Gypsum + -ferous: cf. F. gypsif[`e]re.]
   Containing gypsum.
   [1913 Webster]