I know this is a long shot but I hope I can get some help!I recently purchased this set of three Arkansas stones in box it has a soft/washitas( looks like my old Smith washitas) a hard and a black which is why I bought it originally. Based on the box it looks like an old Smiths bought I am not sure that is what it is. Second question I have is, is it possible to identify equivocaly whether the black stone is actually novaculite or one of the dunstons without destructive testing or specific gravity. Currently I don't have a scale to check it. The stone does appear much harder than the dunstons I had before I sold it but I is completely opaque.