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Eucalyptus spp. of the family Myrtaceae. Aka coolabah, this wood is native to Australia. There are at least half a dozen eucalyptus species that have this common name and given that there are approximately 6,000,000 different species of ecualypus available in Australia, I'm not even going to TRY to distinguish them.
I note that all of these pics are of burls but I have no idea whether there is lumber associated with any of the various species.
burls --- some of these, and perhaps all of them, are coated with wax or other finishing agent.
burl listed as coolibah / Eucalyptus microtheca --- I think the color is over-saturated in the red
coolibah burl turning stock
coolibah burl pen blanks
although identified where it was posted as a coolibah burl, it looks to me as though this might be a redwood burl