Pipestone

I am the proud owner of the world's largest collection of pipestone. I am likely the world's only collector of pipestone. No not the stuff that you can make smoking pipes out of, I mean real pipes. Picture a 5" diameter iron pipe, about three feet long. (my best piece) These naturally occurring pipes are only found near West Blocton, Alabama in quaternary alluvial deposits of sandy clay. No one I know knows how they were formed. The best guess is that they are the casts of tree roots. (unlikely). If any of you all have any ideas or know of any other examples, please let me know.

Jackie, Dumb, dumb, dumb. Me, the pipestone king; Can I change my image stone from a helictite to a pipestone?
Thank you,
Milum.