To carry on from the recent thread on Natural Whetstone arks, it seems some stones received are arkams or dunston. I can find no info on what a Dunston stone is besides 'not an ark' or between a hard and true black. Mine has a high sg but flattened easier than my trans black, though it wasn't easy. I have seen people complain about dunstons without lapping and love them after lapping. Any comments or opinions are welcome. I am sitting here with a 10"*3"*1" with a glassy finish after lapping it.