Well, that's not the case at all, so I need to correct your observation. Not only is it indigenous, and not Norse, but it is a known diagnostic style for the indigenous Maritime Archaic complex/tradition/adaptation. The style shown is the style of Maritime Archaic slate points, fits the style to a tee, fits no known Norse style at all, and the only question remaining is what it is actually made of. But it is most certainly indigenous; that's not based on guesswork, it's based on over 100 years of research of that culture.
73dguard, the slate points after which the bone points were modeled are dated thousands of years earlier then any Norse presence on Newfoundland, or Greenland for that matter. These items are found in contexts thousands of years prior to Viking arrival anywhere in the New World.
And, again, the hot pin test will tell you if it's bone or ivory....
Elfshot: Ground Slate Lances