I looked into the word "Ironwood" a few years ago out of curiosity and
spent a few hours googling, there are at least five species in the US
with that name, and I found about 35 trees worldwide that go by that
name.

At any rate, be prepared to have to re-grind your tools. I tried
turning some dry eucalyptus once and the chips felt like BB's on my
skin, and the tool edge was junk after just a few minutes. Your beams
may be similar, but it's probably really beautiful.