Without question, one of the world's hardest, most dense woods, Argentinian Lignum Vitae is very similar to its namesake -- the world's most dense wood, genuine Lignum Vitae -- in appearance, working properties and physical characteristics. (Both are classified in the same scientific family, Zygophyllaceae.) It is a beautiful wood, with heartwood colors ranging from medium to dark brown, quite often featuring green highlights (sometimes in a prominent fashion) which become more pronounced as the wood ages and is increasingly exposed to UV rays. Sapwood is pale yellow. Its grains can be straight, wavy or slightly interlocked, and it has a smooth, consistent texture and an impressive natural luster that emerges with fine-grit sanding.