Neil, that's amazing info, thank you!. If I'm judging right then, this is big oak. It is horrendously fragile, terrible to turn & a crying shame now that my 6th pen blank has b****y exploded!!, I can imagine this wood as being very old, as it was covered in clay type mud I would assume it has been dug up @ some point. Well, I've managed to finish my 2nd pen, I'm not overly happy with it as it has taken all day, lots of filling with CA & dust that I sanded a broken blank into. Again & apologies to all about the poor pic ( I'm getting there! ), but I think it shows how black the wood is if not the grain contained.