I agree with Kurt that this does not look like any vermiculite photos I've ever seen, I looked really closely at a sample I took (see pic) and this stuff doesn't have any of the signature vermiculite accordian like rock shapes anywhere in it. The little brown pieces are pieces of the cellulose insulation that is mixed in. Also, from what I read, vermiculite is soft like popcorn, this stuff is literally hard as rocks. This almost looks like gravel, chalk, and plaster chunks. Click to Enlarge 92.15 KB