ever hear of green heart

my son got some large logs used for pilings called green heart. these have never been in water. i split them along with some oak and they are way heavier than the oak, split about like oak . they were pretty dry so i threw a split in the stove and it burst into flames fast and burned twice as long as oak, what is this green heart

It's a tropical hardwood, like teak. I think it might be one of those woods you should wear a mask if sawing, FWIW.

Carful with that wood. Read below.
http://www.woodmagazine.com/materials-guide/lumber/wood-species-2/greenheart/

does anyone have pics cause we never identified some wood i got It was green in the center.