I don't know the particular species of Eucalyptus... this one died on the hoof, in my home town.
This form was from a gnarly looking chunk of it, done natural edged.
It's 8" dia x 5" high x 3/8" thick. Finished with Lacquer, buffed with Tripoli, WD, and then Wool Waxed with Master's Magic. Chatoyance all over this piece.
Bright sun on my photo bridge... sorry... no time for the tent.