I have recently been working with Locus (I think it’s Black Locus Robinia pseudoacacia), it is hard and I mean really hard – in fact it is 1700 on the Janka hardness scale. Teak is a mere 1070 and White Oak 1350. It can grow to 100′ and has a crushing strength of 10,200 lb/in² and has no characteristic odour, unlike African Juniper that has a pleasant, cedar-like scent.
You are probably wondering how I know this stuff. Apart from the fact that I am a Fund of useless Knowledge. Well, I found a great website, The Wood Database, that is a repository of information about all wood spices.
The site even has a ‘periodic table’ of wood showing physical properties that is easily searchable.