Anybody have any ideas? I suspect it is a form of coticule from what it looks and behaves like.
Dimensions are 6.25" x 1" x 1.6" roughly, widest part is not ground smooth but seems fractured somehow to shape. Sides are circular ground to be pretty flat and smooth.
http://i1152.photobucket.com/albums/...ps7g9fze8p.jpg
http://i1152.photobucket.com/albums/...psj10tv0lb.jpg
http://i1152.photobucket.com/albums/...psnvmqndjo.jpg
http://i1152.photobucket.com/albums/...ps49x41vf6.jpg