Source : Webster's Revised Unabridged Dictionary (1913)

Basaltic \Ba*salt"ic\, a. [Cf. F. basaltique.]
   Pertaining to basalt; formed of, or containing, basalt; as
   basaltic lava.

Source : WordNet®

basaltic
     adj : of or relating to or containing basalt; "basaltic magma is
           fluid"