Black Locust
Robinia pseudoacacia • Hardwood
Grain Pattern
Straight to slightly wavy or interlocked; shows prominent cathedral figures on flatsawn surfaces of the bowl. Large, conspicuous pores are visible as darker streaks (vessel lines).
Color Description
Heartwood is pale yellowish-olive to yellowish-brown. It typically darkens to a golden brown over time. Features high natural luster and some chatoyance under light. Notable for having greenish-yellow hues when freshly cut.
Hardness Rating
1,700 lbf (Hard)
Durability Rating
Very Durable; exceptionally resistant to rot and insect attack, commonly used as a chemical-free alternative to pressure-treated lumber.
Common Uses
Fence posts, boatbuilding, flooring, furniture, woodturning (bowls), and tool handles.
Geographic Origin
Native to the Southeastern United States; widely naturalized throughout North America, Europe, and Asia.
Market Value & Sustainability
Estimated Market Value
$6.00 - $12.00 per board foot depending on figure and availability.
Wood Age Estimate
The wood is likely from a mature tree (30+ years) given the growth ring spacing, while the finished bowl appears to be a contemporary craft piece showing slight oxidation of the inner pulp.
Sustainability Status
Not listed on CITES Appendices or the IUCN Red List; considered a highly sustainable, fast-growing domestic hardwood.
Workability
Challenging to work due to high density and hardness. It has a high blunting effect on tool edges. Glues and finishes well, though the large pores may require filling for a glass-smooth surface.
Notable Features
Fluoresces under UV (black) light, turning a light yellow-green. Contains high levels of tannins and is very heavy. The dust can be a skin/respiratory irritant for some.
Finish Recommendations
Penetrating oils (tung or linseed), polyurethane, or shellac. The wood's natural oils and density mean it takes film finishes very well once sanded to a high grit.
Identification Confidence
High; the yellowish-olive hue, ring-porous structure with clearly visible tyloses in the pores, and the specific 'cathedral' figure are characteristic of Black Locust.