Thanks for the excellent bit of research on this one. This 'stone' has been puzzling me for ages. Unfortunately the source of the information about this supposed stone and how it was posted here is lost. Vicky's posts were always reliable and well sourced but we're not in touch with her any more sadly. At the moment it's a mystery so thanks for shedding some light.
Something is not right. This message is just to keep things from messing up down the road