Carrion Crow

My book says it is a Carrion Crow!But it has some of the looks of a Raven.It has it's arched,slight crossover beak and it was definitely big!Its feathers were as yo can see,very blue black and very glossy.Where as Crows are always that little duller?
Whatever it was it was a very Majestic bird.Huge span of wings and so 'smooth' in the air.