Today in the mail:
An unknown monster hone from my brother.
http://www.olivia-seife.de/images/monsterhone_1.jpg
http://www.olivia-seife.de/images/monsterhone_2.jpg
http://www.olivia-seife.de/images/monsterhone_3.jpg
Since he's quite a brain it should be worth lapping.
Its a bit rough for a bench stone and a bit heavy for a hand held, LOL (1300 g / ~3 lb)
Yet have to ask him what it is exactly, but I think its some kind of a thuringian. (He lives 60km south of the old mines)