I need help identifying this.  It was in my childhood rock collection.  It looks a LOT like some of the corpolite pictures I see online.  Does it look like that to you all?  It probably came from central North Dakota since that was where I lived, but even that I'm not sure about because we did go on family trips to Montana, and sometimes South Dakota.  So it could possibly have come from those states as well. Anybody have any ideas what it is?