Thanks for clearing that up. I'm coming across that a lot, where stones close to one another have their attributes crossed. The internet is great but people that write pages without proper research send me off on the wrong track more often than not.

Sounds as if slidey stones can have any kind of name then Tiompan, not just be called witch stones. Maybe the sliding aspect was such fun, or barren women so persistant, that the practice lasted into modern times, and so became associated with witches at a later period.