The Collaborative International Dictionary
Spathic
Spathic \Spath"ic\, a. [Cf. F. spathique, fr. F. & G. spath spar.] Like spar; foliated or lamellar; spathose.
Spathic iron (Min.), siderite. See Siderite (a) .
Douglas Harper's Etymology Dictionary
spathic
1788, from French spathique, from spath, from German Spath (see feldspar).
Wiktionary
spathic
a. 1 (context geology mineralogy English) Having good cleavage. 2 (context neologism slang English) Having attractive cleavage of the breasts.