Why not just grind one of the bone piece and throw it in the wind/river
or have pigs eat it. There, problem solved.
I've seen this idiotic premise in so many movies (Lara Croft comes to mind). Some powerful artefact get split n-ways and all pieces are protected by some dedicated people and then in the end when evil assembles all of them together it takes a pickaxe to break the thing and end everybody's misery.