I don't put much into small fragments once have learned what they are. They just go into a bucket at my house to use for practicing cleaning fossils or part for later. Maybe some sort of Frank in fossil art piece. Lol I recently went back and looked through this bucket to see if I had some bits from a fossil someone else found and needed the rest of. No luck, but I did come across this guy. I believe it is a dipleura eye. Gosh darn it trilobite fossils are so beautiful in their preservation! I can only imagine that someone found most of him, is missing the eye. A real shame. Please let me know if this is your eye.