Basaltic

[bә'sɒ:ltik]

(adj.) of or relating to or containing basalt; 'basaltic magma is fluid' .

Checker: Yale--From WordNet

(a.) Pertaining to basalt; formed of, or containing, basalt; as basaltic lava.

Checked by Genevieve

The walls were smooth and appeared to be composed of a black, basaltic rock. Edgar Rice Burroughs. The Gods of Mars.

Checked by Genevieve