The Collaborative International Dictionary of English v.0.48:

Spathic \Spath"ic\, a. [Cf. F. spathique, fr. F. & G. spath
   spar.]
   Like spar; foliated or lamellar; spathose.
   [1913 Webster]

   Spathic iron (Min.), siderite. See Siderite
   (a) .
       [1913 Webster]