That may be so, but I assure you the black marble reffered to in Carrickfergus, definitely refers to the Black marble produced in Kilkenny Ireland, I should know, I was born there. It may also as someone has suggested refer to a grave stone as most of the older stones in The main KK graveyard are of Black marble, though the stiry as I've heard it re the songs, goes that he died after promising to return there to settle down with the lady in question.