Off of a redwood?!
Yeah, we have big limbs down here.
Nope, that's a southern blue gum, E.globulus. It's pretty heavy stuff, between your black locust and osage but not as good as some other eucalypts for burning (but still ok). Many trees in my immediate vicinity are easy enough to split with a maul but he first time I tried to split a bit of blue gum across the grain the maul bounced off without leaving a mark. It was like I had hit it with a rubber mallet. Took me a while to learn you can split it off around the edges but for big rounds you need to be prepared to hit it as hard as you can half a dozen times at least per split. And you'd better make sure you're hitting the same spot.