Can you take a shot of the end grain? Is it very dense? That may be a bamboo product. To make it, they open up the bamboo and compress it together so it is usually very dense (my 900 sq feet had a ship weight of 3000 lbs). It also will splinter on the ends rather than crack down the grain. Normally it has a very sporadic grain pattern on it without any noticeable cathedrals and can be fairly streaky. The end grain will be porous, but does not have any structure to it like a normal piece.
