Common Name(s): African mahogany, khaya, acajou d’Afrique
Distribution: Tropical Africa
Tree Size: 100-200 ft (30-60 m) tall,
3-6 ft (1-1.8 m) trunk diameter
Average Dried Weight: 33.9 lbs/ft3 (545 kg/m3)
Specific Gravity (Basic, 12% MC): 0.46, 0.54
Janka Hardness: 850 lbf (3,800 N)
Modulus of Rupture: 11,730 lbf/in2 (80.9 MPa)
Elastic Modulus: 1,410,000 lbf/in2 (9.72 GPa)
Crushing Strength: 6,570 lbf/in2 (45.3 MPa)
Shrinkage: Radial: 3.4%, Tangential: 5.7%,
Volumetric: 9.3%, T/R Ratio: 1.7
Color/Appearance: Heartwood ranges from pale pink to a deeper reddish brown, sometimes with streaks of medium to dark reddish brown. Colors darken with age. Quartersawn surfaces exhibit a ribbon-stripe appearance.
Grain/Texture: Grain is straight to interlocked, with a medium to coarse texture. Good natural luster and a high degree of chatoyancy.
Rot Resistance: Rated as moderately durable; moderate to poor insect/borer resistance.
Workability: Generally easy to work, though tearout can be a problem if the grain is interlocked. May stain and react with iron-based fasteners in damp conditions. Glues, turns, and finishes well.
Odor: No characteristic odor.
Allergies/Toxicity: Although severe reactions are quite uncommon, African mahogany has been reported as a sensitizer. Usually most common reactions simply include eye and skin irritation. See the articles Wood Allergies and Toxicity and Wood Dust Safety for more information.
Pricing/Availability: Available in a variety of lumber sizes, as well as plywood and veneer. Prices are moderate for an imported hardwood.
Sustainability: This wood species is not listed in the CITES Appendices, but is on the IUCN Red List. It is listed as vulnerable due to a population reduction of over 20% in the past three generations, caused by a decline in its natural range, and exploitation.
Common Uses: Veneer, plywood, turned items, furniture, boatbuilding, and interior trim.
Comments: There are currently five accepted Khaya species, four of which are harvested and sold as African mahogany. The fifth species, K. madagascariensis, is native to Comoros and northern Madagascar and yields mahogany-like wood, but isn’t commonly exported.
Of the four commercial species, there is considerable variation in density and heartwood color. The two lightest species, K. ivorensis and K. anthotheca, are represented here on this page. The heaviest species, K. senegalensis, is sometimes called dry zone mahogany and has markedly higher density and has been given its own entry. Lastly, K. grandifoliola occupies a middle-ground in terms of density, sometimes being mixed and sold with the former two lighter species, and sometimes grouped with the heavier K. senegalensis.
According to Plant Resources of Tropical Africa,Louppe, D., Oteng-Amoako, A. A., & Brink, M. (2008). Plant Resources of Tropical Africa 7 (1). Timbers 1. PROTA foundation. the average specific gravity of each of the commercial species at 12% moisture are as follows:
- K. ivorensis—0.52
- K. anthotheca—0.58
- K. grandifoliola—0.69
- K. senegalensis—0.76
Botanically, Khaya is a part of the Meliaceae family, which not only includes mahoganies, but also sapele (Entandrophragma cylindricum), Spanish cedar (Cedrela odorata), and a host of other commercial species. Considered to be a valid substitute for Honduran mahogany (Swietenia macrophylla), otherwise known as ‘genuine mahogany’—though the African species sometimes lack the deeper reddish brown color and durability that’s common for true mahogany in the Swietenia genus.
Images: Drag the slider up/down to toggle between raw and finished wood. The first sample shows a typical flatsawn piece, while the second sample shows quartersawn grain.
A special thanks to Steve Earis for providing the turned photo of this wood species.
Porosity: diffuse porous
Arrangement: solitary and radial multiples
Vessels: large to very large, very few; dark brown to nearly black deposits occasionally present
Parenchyma: vasicentric, and occasionally banded (marginal)—though marginal parenchyma isn’t typical for Khaya species
Rays: medium to wide; normal to fairly close spacing
Lookalikes/Substitutes: Very commonly confused with the New World mahoganies in the Swietenia genus. However, Khaya species will very frequently lack maringal parenchyma bands. For more information, see the article Mahogany Mixups.
Notes: Although there is a subtle gradation in density between the various Khaya species, they can’t be reliably separated on the basis of anatomy.
|↑1||Louppe, D., Oteng-Amoako, A. A., & Brink, M. (2008). Plant Resources of Tropical Africa 7 (1). Timbers 1. PROTA foundation.|