Ironbark is a favourite firewood in a lot of Australia where it grows (generally, the open sclerophyll forests between the arid regions and the wet regions have eucalypts as their dominant species, with the exact variety varying with soil type and aspect). We have quite a few on our block that have died in the last two droughts. This one carked it about 3 years ago, and if you leave them standing too long, water gets in from the top and fungi rot out the interior hardwood. When they are a few years old, the very hard ("iron") bark can be broken off in sheets, leaving the trunk clean for the chainsaw, so I knock off the bark before attacking them - decided to try pushing this smaller one with the tractor first, and it came down fairly easily. It is interesting to see them come out of the ground - this is a poor sandy soil on old rhyolite lava flows - the fragments of rock in the pics are quite white when clean. This soil makes me jealous of JohnMacca's country!
Once down, this one was cut into blocks just under 400mm long (just right for the old wood stove), then split on the hydraulic splitter and stacked to season for a year or two. I find that in blocks, iron bark needs 2 or more years, as JohnMacca mentioned, but if split when "fresh", will season much more quickly (but it strains the 45 ton splitter getting through the larger sections).
Thought it was about time I put in another Australian pic or 5

Mort