Janka hardness measures the force required to embed an 11.28 mm (0.444 in) steel ball into wood to half the ball's diameter, in pounds force.
- Lignum Vitae - 4500
- Patagonian Rosewood - 3840
- Brazilian Ebony - 3692
- Brazilian Walnut - 3684
- African Pearlwood - 3680
- Bolivian Cherry - 3650
- Lapacho - 3640
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