I posted this a while back and I believe it helped someone... your welcome to it... hope it helps you! Trade Beads -- Illinois State Museum



The 1st photo is of glass trade beads the 2nd, 3rd and 4th are of a crinoid stem that was used for a bead. You can see wear on this one, if you are finding these and they show no wear then they are a fossil. The one I'm showing has a polish to it from being worn, also it was found with another stone bead that was made into an Owl effigy. You will find crinoids in just about all gravel deposits and in some areas you can pick them up by the handful.