I found the the pure white Quartz piece and posted it a few months ago, the second yellow Quartz piece was found by my girlfriend at the same site. They are both similar and interesting.
They could be large waste flakes the quartz was so hard to find a good one to use I know of a place that is just littered with quartz pieces and very few tools mixed in but you could spend a whole day of bending if you wanted to just to find broken pieces of debitage of all sizes.