Well, yeah, it's a water worn round creek pebble rock that kind of looks like a fossilized garbanzo bean.
What do you think it is?
When a stone is polished, whether naturally or by man, a lot of the "tells" to identify what mineral it is are hidden or removed,
so you have to run tests like;
Is it harder or softer than quartz?
What color is the "Streak"?
Does it fluoresce?
Is it magnetic?
It's probably a piece of quartz.
Keep on digging!