quick vermiculite question

I want to pick up some vermiculite at home depot and I'm wondering if there's a certain kind I need.. or are there any additives that are sometimes put in that I need to watch out for?

Thanks in advance. :P

i would just make sure there's nothing add to the vermiculite. i really don't think they have any with additives but you never know. and i would also get a bag of perlite(sp).as i mix the two together.

Ok will do.. thanks.