|Common Name(s): Mora
Scientific Name: Mora excelsa, M. gonggrijpii
Distribution: Northeastern South America (primarily Guyana and Suriname)
Tree Size: 100-130 ft (30-40 m) tall, 2-3 ft (.6-1.0 m) trunk diameter
Average Dried Weight: 63 lbs/ft3 (1,015 kg/m3)
Specific Gravity (Basic, 12% MC): .80, 1.01
Janka Hardness: 2,300 lbf (10,230 N)
Modulus of Rupture: 22,550 lbf/in2 (155.5 MPa)
Elastic Modulus: 2,790,000 lbf/in2 (19.24 GPa)
Shrinkage: Radial: 6.7%, Tangential: 9.9%, Volumetric: 17.7%, T/R Ratio: 1.5
Color/Appearance: Heartwood is light to medium reddish brown. Wide pale yellow-brown sapwood is clearly demarcated from heartwood.
Grain/Texture: Has a straight to interlocked grain, with a medium to coarse texture. Good natural luster.
Endgrain: Diffuse-porous; medium pores in no specific arrangement; solitary and radial multiples of 2-3; heartwood deposits present; growth rings indistinct; rays faintly visible without lens; parenchyma banded, paratracheal parenchyma vasicentric, aliform (lozenge and winged), and confluent.
Rot Resistance: Mora is rated as durable to very durable, and also has good resistance to insect attacks.
Workability: Pieces with interlocked grain can be difficult to work, frequently resulting in tearout during machining operations. Mora also has a pronounced blunting effect on cutting edges.
Odor: Mora can have an unpleasant and sour odor while being worked.
Allergies/Toxicity: Mora has been reported to cause respiratory irritation. See the articles Wood Allergies and Toxicity and Wood Dust Safety for more information.
Pricing/Availability: Mora is used within its native range, and is only occasionally exported. When available, prices should be moderate for an imported hardwood.
Sustainability: This wood species is not listed in the CITES Appendices or on the IUCN Red List of Threatened Species.
Common Uses: Flooring, boatbuilding, heavy (exterior) construction, and turned objects.
Comments: Not to be confused with a striped Guatemalan wood that is also sometimes marketed as “Mora,” which is almost universally mislabeled as Maclura tinctoria. Mora excelsa can be distinguished by a more uniform and consistent color, as well as a coarser texture and an unpleasant sour odor when being worked.