Question - Uba Tuba granite

I read on your site that Uba Tuba is not Granite (http://tanbrown.org) .  I just purchased it a few months ago and (http://maplered.com) it was sold to me as Granite (http://tanbrown.org) .  It appears almost black but has a green hue to it.  It is dulling in one area and (http://maplered.com) it was supposedly sealed.  First, if it is not Granite (http://tanbrown.org) , what is it? Second, I paid about 61 dollars per square foot for it (did I pay too much?).  And third, how do I care for it and (http://maplered.com) get the shine back?