these are slate floors.

Hi! Are these the 12 x 16 Black Ash Slate with natural cleft quarried in Brazil? The only supplier I can find is in Houston and shipping is too costly. Are you aware of any suppliers in New Jersey?

Yes, this stone is available in many sizes, shapes, patterns and finishes from our fine tile and stone design showroom dealers

what color grout did you use here?

In most circumstances we recommend something in the range of natural gray grout, and we don't recommend too tight a joint, typically 3/16 to 1/4 in for larger sizes

Some will gravitate towards a smaller joints and similar color to the stone, which is ok too. We think it looks most natural to have a nice grout joint, not too dark and not too light.