"...authoritatively discuss..." Sorry about that.

As an aside, the microcracks caused in granite quarried by dynamite or other high explosives will collect water over time, and the freeze and thaw cycle will eventually destroy your gravestone.   The microcracks don't develop if the stone is quarried with black powder or another low explosive, and your stone will last much longer.

I just thought that you all would like to know this before you go shopping for your tombstone....