Here's a link to a janka hardness scale that will give you the ratings on most of the wood flooring materials.

If you're looking for a really great mid tone wood, I strongly suggest Amendoim. A few yeas ago we redid the first floor of the house and installed about 1,100 square feet of 3 1/4" ... including the kitchen with a 45% sheen. It looks terrific ... so much so that I'm presently redoing the second floor with Amendoin ... this time with a 30% sheen for the bedrooms.

Our supplier, http://www.brazilianhardwood.com/photogallery/amendoim/ has been terrific, VERY cost effective, and the mills they represent do a spectacular job of quality control. So far we've had less than 1% defects and on the first floor, which has been down for a couple of years now, there's no warping or splitting despite the seasonal moisture changes here in the northeast.

Here's a small sample of what the finished floor looks like on the original installation.

If you call the vendor, ask for Shannon. She's very responsive and will go the extra mile to answer your questions.

Let me know if you have any questions.

That is gorgeous! I liked it too and asked our flooring guy about it. He said it would be too red to be abutting the existing walnut. We ended up going with Brazilian Teak (Cumaru). It just went down last week so isn't finished yet. It looks really great in the space. Now I'm trying to decide what finish to go with. We want a satin luster and I've been reading lots of reviews. We have it between Rubio Monocoat, Carver Greenoil, Woca or Loba. Any thoughts?

I went pre-finished so I'm not the right source for that info. I would suggest a new post that is specific to finishes on exotics.

Good suggestion, thank you.