Soapstone at Lee Valley Tools:
http://www.leevalley.com/wood/page.aspx?c=2&p=32712&cat=1,250,43298
If you are not familiar with Lee Valley, they sell some nice tools; great service and great catalog!
I have some Gray soapstone and have made a pen using it. It turns okay, just sorta becomes a powder. If you PM me with your address, I'll cut some and send it to you. It is hard on the tool, but not more than Oak Burl, or Ash Burl!
Here's the pen I did with it.
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I think the next one I do with this stuff, I'll use a Satin Gold or Satin Chrome kit with it.
Thanks Kurt, just received the soapstone and is on my list for this weekend. Preaching a revival meeting this week so too tired to turn during the day.