Thank you for reaching out to us on this project.

The actual design of the fountain with sharp angles and interior cleaved effect of the

spa are as important as the material itself in creating this effect. This project was completed several years ago and I will look to see if I can find the exact tile name for you.

However I think it came from Noble tile in Dallas and is quite common.

It is a black thin (horizontal line) tile that accompanies the physical attributes of the construction that make the effect. Hope this helps.