My builder uses Houzz Pro to plan the timeline and give detailed estimates and daily updates with photos of progress, and provide invoices at pre-agreed key points in the build. This made the whole experience much more efficient and stress-free.
I would contact a local slab yard and show them the picture as different yards may call it something different. I believe this is a combination of classico and noche travertine cut to various sizes.
Horst Architects
Lori Martin Reeves