Couldn't find anything on wordorigins, faldage, but if I can post a link correctly here, stone wine is made from vines grown on a stony field - see here http://66.102.9.104/search?q=cache:a2iNXDb9tXUJ:internet.sk/mediakurier/cei/e41.htm+"stone+wine+is"&hl=en&ie=UTF-8

I don't know if we got anywhere in the other discussion. Just hope this doesn't confuse.