Black Walnut (Burl)
Juglans nigra • Hardwood
Grain Pattern
Highly irregular and wild burl figure. Characterized by dense, swirled, and knotted clusters of abnormal growth known as 'eyes' or 'dormant buds' with high amounts of tension wood around the protrusions.
Color Description
Heartwood ranges from medium to deep chocolate brown; sapwood is pale yellowish-gray. This sample shows dark brown to near-black mineral streaks and intense color variation within the burl protrusions. Becomes more golden-brown as it ages.
Hardness Rating
1,010 lbf (Medium)
Durability Rating
Durable. Heartwood is very resistant to decay; sapwood is susceptible to insect attack.
Common Uses
Turning (bowls/knobs), knife handles, high-end furniture accents, veneers, gunstocks, and artistic woodworking.
Geographic Origin
Eastern and Central North America
Market Value & Sustainability
Estimated Market Value
$15.00 - $40.00 per board foot, though high-quality burl is often sold by weight or individual piece at a premium.
Wood Age Estimate
The sample appears to be recently harvested or stored raw (1-3 years old) based on the presence of dirt and the lack of deep oxidation on the exposed surfaces.
Sustainability Status
Not listed in CITES Appendices or on the IUCN Red List; generally considered sustainable and widely available from managed forests.
Workability
Difficult due to the wild grain/burl; prone to significant tearout during planing or turning. Sands well and glues easily. High figure requires very sharp tools.
Notable Features
Distinctive mild spicy scent when cut. Can cause sensitizing reactions or skin irritation in some individuals. Known for high luster and excellent dimensional stability once dried.
Finish Recommendations
Penetrating oils (tung or linseed) or shellac to 'pop' the figure; high-gloss polyurethane or lacquer to enhance depth and chatoyance.
Identification Confidence
High; the characteristic bark-like burl protrusions, deep chocolate heartwood color, and growth habit are quintessential for North American Black Walnut burl specimens.