Medium-High; identified by the distinctive yellowish-green hue of the wood, the rugged deeply furrowed bark, and the presence of localized burl growth. confidence

Black Locust

Robinia pseudoacacia · Hardwood

Type: Hardwood
Origin: Native to the Appalachian and Ozark Mountains of the Eastern United States; widely naturalized across North America and Europe.
Hardness: 1,700 lbf (Hard)
Durability: Very Durable; exceptional resistance to rot, decay, and insects. One of the most durable woods in North America.

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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 & Appearance

Pale greenish-yellow to golden brown heartwood, becoming darker russet brown with age. Thin sapwood is yellowish-white. Shows high natural luster.

Hardness (Janka)

1,700 lbf (Hard)

Durability & Decay Resistance

Very Durable; exceptional resistance to rot, decay, and insects. One of the most durable woods in North America.

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.

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.

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.