"Jon, I think you may be assuming density and hardness are the same. From what I found, Lignum Vitae is actually more dense than Australian Buloke, even though it has a lower Janka hardness. If you look on wood-database.com, it lists the density of Lignum Vitae at 1,260 kg/m^3, while Australian Buloke is listed at only 1,110 kg/m^3.Cheers"