Spotted Gum is really several closely related species (Corymbia maculata, Corymbia citriodora and Corymbia henryi) and is another timber that is not really a native of Tasmania. We access it in two ways; in pallets, where they sometimes use flitches from saw mills and from the scrap bin at a local wood supply yard. It is commonly used for decking and flooring; it looks good and is very, very hard.
It is probably OK to work if you have nice, straight grain but the stuff we get can be a right pain; at times it is like trying to hand plane a lump of steel. It is right up there with some of the toughest timbers in the world and although it is difficult to plane, funnily enough, it sands well.
The variation in colour and texture can be quite extreme – even in a single piece of timber. Sometimes quite dark it can also have grey streaks through it and some nice grain patterns.
Wood Solutions: https://www.woodsolutions.com.au/wood-species/gum-spotted