Just because the link doesn't seem to show up well in my reply to the comments of Lukysh to one of my recent posts, I'll put it here with a proper link:
The geo-metamorphism e-mail list seems to be a very good resource for answers to questions on any number of technical topics. I also note that there are a number of other geology (and other sciences) e-mail lists on that server (click on the "Email Lists button in the upper left corner).
Fake but true
13 hours ago