An ironwood tree, the Australian Buloke.
Measuring strengths of woods is important for determining whether the timber is fit for purpose. While the hardest wood is an Australian native, if you're looking for really hard woods, head to South America.
Top 10 Hardest Woods in the World
1. Australian Buloke: 5,060 IBF
2. Schinopsis Brasiliensis: 4,800 IBF
3. Schinopsis Balansae: 4,570 IBF
4. Lignum Vitae: 4,500 IBF
5. Piptadenia Macrocarpa: 3,840 IBF
6. Snakewood: 3,800 IBF
7. Brazilian Olivewood: 3,700 IBF
8. Brazilian Ebony: 3,692 IBF
9. Brazilian Walnut: 3,684 IBF
10. African Pearwood: 3,680 IBF
https://www.hitchcockandking.co.uk/h-k-news/top-10-hardest-woods-world/