Koa
Acacia koa · Exotic/Tropical Hardwood
- Type
- Exotic/Tropical Hardwood
- Origin
- Hawaii, USA (Endemic to the Hawaiian Islands)
- Hardness
- 1,110 lbf (Medium)
- Durability
- Moderately Durable; resistant to decay but susceptible to insect attack (beetles).
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Grain Pattern
Highly figured with strong interlocked grain and wavy "curly" or "tiger stripe" figure (fiddleback). Large open pores typical of Acacias.
Color & Appearance
Heartwood spans medium gold to reddish brown with dark streaks and ribbons. Exhibits high chatoyance (luster that shifts with light). Darkens to a deep amber-red with age.
Hardness (Janka)
1,110 lbf (Medium)
Durability & Decay Resistance
Moderately Durable; resistant to decay but susceptible to insect attack (beetles).
Value & Sustainability
- Estimated Market Value
- $40.00 - $150.00 per board foot depending on figure intensity.
- Wood Age Estimate
- The heavy oxidation and surface scratches suggest a sample at least 20-40 years old, likely part of a vintage furniture piece.
- Sustainability Status
- Not CITES listed or IUCN threatened, but endemic and highly regulated in Hawaii. FSC options are limited.
Common Uses
Musical instruments (ukuleles, guitars), fine furniture, cabinetry, boat building, veneers, and woodturning.
Geographic Origin
Hawaii, USA (Endemic to the Hawaiian Islands)
Workability
Difficult due to interlocked grain which causes tearout during planing. Glues and finishes well, but requires sharp tools to handle figure changes.
Finish Recommendations
High-gloss lacquers or penetrating oils (tung/Danish oil) to emphasize depth and chatoyance. Grain filling is often necessary for a smooth surface.
Notable Features
Exhibits stunning chatoyance; no distinct scent. Historically used by Hawaiian royalty for canoes and weapons.
