The Collaborative International Dictionary of English v.0.48:

Verd antique \Verd` an*tique"\ [F. vert antique a kind of
   marble; verd, vert, green + antique ancient: cf. It. verde
   antico.] (Min.)
      (a) A mottled-green serpentine marble.
      (b) A green porphyry called oriental verd antique.
          [1913 Webster]

WordNet (r) 3.0 (2006):

verd antique
    n 1: a dark green impure marble [syn: verd antique, verde
         antique]