From the Wood Database, it is call ed Ipe, Brazilian Walnut, or Lapacho
Scientific Name: Handroanthus spp. (formerly placed in the Tabebuia genus)
For a zillion photos: http://hobbithouseinc.com/personal/woodpics/ipe.htm
To put it in perspective, Ipe is a touch lighter in weight than Mountain Mahogany but significantly harder on the Janka scale (15,620 N vs 14,230 N). Mature Ipe trees are larger, 2-4' dia.
JKJ