How to Identify Réunion Tamarin Acacia

Start with the heartwood-to-sapwood contrast. Réunion Tamarin Acacia shows a warm dark reddish-brown heartwood, often streaked, set sharply against a pale cream-to-straw sapwood — the crisp light-and-dark boundary seen on the sample. Concentric growth rings and a radial grain running out from the pith are usually visible on the face, so a board that pairs dark streaked heart with a clean pale sap band is a good first indicator.

Look for figure and grain direction. Like its acacia cousins, this wood frequently carries fiddleback (curly) or mottle figure produced by wavy, interlocked grain. Tilt the board under light: a rolling, shimmering curl over a reddish-brown ground, with a high natural luster that makes the surface almost glow, points to the acacia group. Straight-grained boards will still show the warm color and the pale sapwood halo.

Check the end grain and heft. The wood is diffuse-porous with a medium, even texture — there is no ring of coarse early-wood pores like you would find on ring-porous oak, ash, or elm, which rules those out quickly. In the hand it feels moderately heavy but not dense like rosewood or ebony; it sits in the medium-hard, walnut-to-koa range. There is no strong characteristic scent, which helps separate it from aromatic tropical timbers.

The hardest calls are within the acacia group itself. Hawaiian koa (Acacia koa) and Tasmanian blackwood (Acacia melanoxylon) are near-twins in color and curl, and heterophylla is genetically almost inseparable from koa — provenance is often the only reliable answer, since tamarin acacia comes specifically from Réunion. It is also mistaken for black walnut, but walnut runs a cooler, grayer brown, shows less rolling fiddleback shimmer, and lacks the bright cream sapwood contrast. And despite the shared "blackwood" family reputation, it should never be confused with true ebony or African blackwood, which are far darker, heavier, and denser.