Black Locust
Robinia pseudoacacia • Hardwood
Grain Pattern
Usually straight but frequently irregular due to knots; coarse texture with a high degree of burl-like figuring and interlocking near knots.
Color Description
Pale greenish-yellow to golden brown heartwood, becoming darker russet brown with age. Thin sapwood is yellowish-white. Shows high natural luster.
Hardness Rating
1,700 lbf (Hard)
Durability Rating
Very Durable; exceptional resistance to rot, decay, and insects. One of the most durable woods in North America.
Common Uses
Fence posts, boatbuilding, exterior decking, heavy construction, mine timbers, furniture, and wood turning (especially burls).
Geographic Origin
Native to the Appalachian and Ozark Mountains of the Eastern United States; widely naturalized across North America and Europe.
Market Value & Sustainability
Estimated Market Value
$5.00 - $8.00 per board foot for standard lumber; significantly higher for burl or figured specimens.
Wood Age Estimate
The sample appears to be from a mature tree, likely 40-60 years old based on the diameter of the log segment and developed bark structure.
Sustainability Status
Not listed in CITES Appendices or on the IUCN Red List; widely available and considered an invasive species in some regions.
Workability
Difficult to work due to high density and hardness. Dulls cutting edges quickly. Excellent for gluing and finishes well, but requires pre-drilling for screws.
Notable Features
Glows under UV (black) light; contains high tannin content; very high energy content for firewood; extremely resistant to moisture.
Finish Recommendations
Oil-based finishes (tung or linseed) to highlight golden tones; UV-inhibiting spar urethane for outdoor use to slow browning.
Identification Confidence
Medium-High; identified by the distinctive yellowish-green hue of the wood, the rugged deeply furrowed bark, and the presence of localized burl growth.