cornelian

from WordNet (r) 3.0 (2006)

cornelian
    n 1: a translucent red or orange variety of chalcedony [syn:
         {carnelian}, {cornelian}]

from The Collaborative International Dictionary of English v.0.48

Cornelian \Cor*nel"ian\ (k?r-n?lyan), n. [F. cornaline, OF.
   corneline, fr. L. cornu horn. So called from its horny
   appearance when broken. See {Horn}, and cf. {Carnelian}.]
   (Min.)
   Same as {Carnelian}.
   [1913 Webster]