Basalt n. : A rock of igneous origin, consisting of augite and triclinic feldspar, with grains of magnetic or titanic iron, and also bottle-green particles of olivine frequently disseminated.

Basalt n. : An imitation, in pottery, of natural basalt; a kind of black porcelain.

Example:
what type of Basalt is used in hot stone massages?

Taxonomy
basalt, composition, wt, rocks, Columnar basalt, eruptions, Pillow basalts, alkali, lava flows, MORB, minerals, bacteria, lava, olivine, alumina, pillow, textures, continental flood basalts.

Defination from the web:
Basalt has also formed on Earth's Moon, Mars, Venus, and even on the asteroid Vesta. ... The crustal portions of oceanic tectonic plates are composed predominantly of basalt, produced from upwelling mantle below ocean ridges. ...