Source : Webster's Revised Unabridged Dictionary (1913)

Marmoreal \Mar*mo"re*al\, Marmorean \Mar*mo"re*an\, a. [L.
   marmoreus, fr. marmor marble: cf. F. marmor['e]en. See
   {Marble}.]
   Pertaining to, or resembling, marble; made of marble.

Source : WordNet®

marmoreal
     adj 1: resembling marble in smoothness; "skin of marmoreal
            smoothness" [syn: {marmorean}]
     2: like marble in hardness [syn: {marmorean}]