Australian blackwood (acacia melanoxylon) . It has a native range along the edge of eastern Australia and also the eastern part of the island of Tasmania. With Koa selling at outlandish prices (now costs me the same per board foot to buy koa as amboyna burl or more) Australian blackwood is a great alternative to koa at much lower prices. If you have worked with koa you’ll know what these are like. Apparently it was called “Blackwood” in Australia because of the fact that the tannins in the wood can leave dark colors on your skin. However I have not noticed any marks on my skin after cutting this wood, so it must vary from one tree to another.