Try searching on 'Guaiacum officinale' as you wont find many listings under 'iron wood'. I think it's the heaviest and densest wood in the world.
'Iron wood' comprises a number of species, the hardest and densest of which is ipe, also known as pau lope, brazilian walnut, and some other names I don't recall. Info is readily available by searching on 'ipe wood'
Formfactor, lightengine etc.