A broken base for sure. Quartz is a lithic that tends to produces either Gem-Grade or very clunky artifacts.
It’s extremely hard and breaks with razor sharp results. It can be quite brittle and many times laden with hidden flaws.
It is my favorite lithic material, as it was also a favorite choice for projectile points during the Archaic, Woodland through the Contact Periods in several regions (especially the Southeastern Coastal States).
That piece has a broad round base, an elliptical cross section, wide thinning flakes from all sides and even-secondary finish flaking on all edges.
Don’t doubt that one. I also believe that it belongs to the Guilford Complex (Middle-Archaic Period, 7500 to 5000 BP)