Ok, I see them now, your larger pic wasn't loading. 3rd time it loaded. Interesting, lets see what the experts say.
It pays to pick anything up of interest.
Just how big is this piece? My guess is a Double Grooved Plummet made from sandstone that has weathered quite a bit. I have quite a few sandstone Plummets and they just don't hold together as well as the Hematite or hardstone ones do.