Just roughed a bowl from Ipe, and I think this is the most difficult wood to turn that I've ever encountered. Dulls cutting edges very quickly. Previously, the winner was Desert Ironwood, but Ipe has a Janka rating of 3510 while the Desert Ironwood is a mere 3260 Janka hardness rating. (That's pretty darn hard and dense, no matter how you look at it.) It didn't help that this piece of Ipe was around 10% MC......so, it's been setting in storage somewhere for a long time to begin with.
https://www.wood-database.com/ipe/
https://www.wood-database.com/desert-ironwood/
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https://www.wood-database.com/ipe/
https://www.wood-database.com/desert-ironwood/
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