The Collaborative International Dictionary of English v.0.48:

Azurn \Az"urn\, a. [Cf. OF. azurin, asurin, LL. azurinus. See
   Azure, a.]
   Azure. [Obs.]
   [1913 Webster]

         Thick set with agate, and the azurn sheen
         Of turkis blue, and emerald green.       --Milton.
   [1913 Webster]