Is this asbestos? it doesn't feel like wood, it resonates when hit like glass. Found it blocking chimney off where a flue liner was.
http://i19.photobucket.com/albums/b177/dansarchive/CIMG0096.jpg
http://i19.photobucket.com/albums/b177/dansarchive/CIMG0097.jpg
http://i19.photobucket.com/albums/b177/dansarchive/CIMG0096.jpg
http://i19.photobucket.com/albums/b177/dansarchive/CIMG0097.jpg