I found this in the creek bed at ceres park near Glassboro, NJ. I actually wasn't sure if it was anything, but a friend was over and said " hey is that one of those clovis point things?!" That gave me the confidence to believe. So I know nothing about it. (nor have I done any research)
Thats quartzite... And likely was a stemmed point or weak based point. Very toigh to work material, rarely thin, and if so, the item was likely made from a large flake then.
Get back there where you found it! Im sure there is more there!!! Awesome start!