Originally Posted by uniongoon
"Ironwood" is a generic term referring to any extremely hard, dense wood with a density close to that of water.
Great photos and discussion on that link. Apparently Lignum Vitae, the hardest of all known woods, grows in Jamaica. It has a specific gravity of 1.37 as I recall (it is 1.37 times as dense as water), compared to my puny Cooktown ironwood at 1.22 and maple at 0.65. By comparison, steel has a specific gravity of nearly 8 and gold is almost 20.