A friend found this the other day on a quick creek walk with his two daughters and I...we didn't really pay much attention to it till we got home but started making is wonder after we got to looking at it more and more.
While you are waiting - I noticed this was your very first post - so, Welcome Aboard Bizcook! Take a look at Sub-Forums: Illinois for information (i.e., clubs, etc.) directly related to your state.
Just this, and I'm not sure of lead, it seemed a little more like pottery to me, but I'm fairly new at this...it was found just by hand sifting through rocks by a sand bar in a small creek that doesn't get many visitors, found some broken axe heads and plummets, broken points.
If it's rock, possibly a section of crinoid stem fossil. Some have a star pattern. Yours would have been where one of the sections like below was. Longer and it would have been a hole through the rock.
Hah = Steve beat me while I was looking for images. ;-)
I thank all of you fellow rock hunters for taking the time to look and clarify what this was!! Folks like you are what makes it a great community! I just hadn't ever seen the star shape before so that was what had me thrown off. I'm off to check out a new field and possibly a new creek, time to go sweat a little bit.