Sardic--prophetes.ai

† ˈSardic, a. Obs. rare¹.
  In 6 Sardique.
  [f. L. Sard-īs (see Sardian) + -ic.]
  = Sardian a. Sardic stone = sard n.¹

1586 J. Ferne Blaz. Gentrie i. 142 The first, is called a Sardique stone, and sheweth in cullor lyke vnto red claie.

Oxford English Dictionary