This came from the same area as the other couple that I found. Interesting design....almost flat on one side, other side is rounded off and worked. Very nice blue/gray color.
Looks like a turtleback scraper, or, the knapper had set it up with that hard beveled edge, to throw flakes off the flat side? That broken base you have there looks mighty interestin`...
I've found several more artifacts since the one above made from the blue/grey stone and after doing a little research, it looks like the tool above is almost exactly like the tool pictured in this link.