The Collaborative International Dictionary of English v.0.48:
Basaltic \Ba*salt"ic\, a. [Cf. F. basaltique.] Pertaining to basalt; formed of, or containing, basalt; as basaltic lava. [1913 Webster]WordNet (r) 3.0 (2006):
basaltic adj 1: of or relating to or containing basalt; "basaltic magma is fluid"