But seriously, it is supposed to be a very black Material. Basalt is for the not-so-black-but-still-black variant.
Hmm but if we had a better shader, Granite and dark void could easily be distinguished because the former would have a specular highlight (when the surrounding area isn't completely dark). How about tweaking the texture a bit so it isn't uniformly black? It is currently pretty bad from the game play standpoint.
For instance, Sky Stone from AE2 is also supposed to be black, but it's not *uniformly* black so you can easily distinguish it from a pitch dark void.