I think Zach may be right. Seems to be valued for carving...I'd ask for some, if I was closer.
I'm not sure what it is other than hard, pretty and heavy.
That would fit both black gum and sweet gum characteristics. Did you try hand splitting a few logs? Oozing water and the wedges pop right back at you, straight up in the air. Gnarly, twisted, and interlocking grain? A bear to split is an understatement!
How'd you cut the slab shown in the pics?
http://www.hobbithouseinc.com/personal/woodpics/gum.htm
An 880 is a Beast! Still, running a chainsaw mill is a good way to shed some pounds. I concur that your log is a member of the gum family.
Scott
That's gorgeous!!!American Elm is one of my favorites. The cross grain patterns are beautiful.
This is how a slab can turn out!