
Photo by David J. Stang, CC BY-SA 4.0, via Wikimedia Commons
Wood Species
Tigerwood
Astronium spp.
- Janka hardness
- 2170 lbf
- Specific gravity
- 0.85
- Workability
- Moderate — wavy/interlocked grain; moisture-resistant nature complicates gluing
Tigerwood is the flooring-trade name for goncalo alves (Astronium spp., mainly A. fraxinifolium and A. graveolens), a Brazilian hardwood whose medium reddish-brown heartwood gets streaked dark brown to nearly black — on the boards that bother to earn the name, anyway.
Working Properties
For all its density, tigerwood only presents moderate machining challenges: wavy or interlocked grain takes a moderate toll on cutters, and its natural moisture resistance can throw a wrench into gluing. It turns and finishes well, and it's rated very durable against decay — this is a wood built to live outside.
Typical Uses
Flooring, furniture, cabinetry, and small specialty items like pool cues and knife handles.
Images

Tree: Location taken: Hotel Bougainvillea, San Jose, Costa Rica. Names: Astronium graveolens Jacq., Astronium balansae, Gonçalo alve Classifica... — Photo by David J. Stang, CC BY-SA 4.0, via Wikimedia Commons
Images are sourced from Wikimedia Commons under their original open licenses -- see each image's caption for its specific license and attribution.

