First, nice point there and looks great!
I think we're banned from linking to anything for sale here, but I recently had my floors tiled with some Home Depot tile and it was porcelain. The stuff was so hard that we had to cut it with a saw - it wouldn't follow a wheel type tile cutter line. Anyway, there is a glaze on the tile that removes easily and it knaps well - look for "Montagna Dapple Gray Porcelain Floor and Wall Tile." It's a 6" X 24" plank tile and cost the whopping sum of $2.39 ea AND you can buy them individually. I think any color in this tile series would be the same. It is indeed porcelain and will not absorb water - so it is well vitrified in the mfg. process, which makes for good chippin'.