Cronin natural stone backsplash

Hello,
I like the look of the cronin natural stone. I want to use it for a kitchen backsplash over new sheetrock. It will be about 15 inches high. It would look something like the desert gold one but is called Puebla here.
This is a non grout produce and projects a little further than the usual tile.
Anybody out there used something like this without the grout.
Here is the url

http://www.cronincompany.com/hendren/croninstone.htm

This is a non grout produce and projects a little further than the usual tile.

It is a "non-grout" product for exterior use. I wouldn't be using it without grout in a kitchen.

Just imagine the filth and mold and mildew and who knows what that could develop in those empty cracks over time.

Use it but also grout it.