Hopefully someone can help ID this exact stone but usually marble with more dramatic veining than Carrara (like statuario or calacatta) is much more expensive especially in a large tile (I know because I recently shopped for this). If you search houzz photos for marble with dark veining you will see similar examples and they are sometimes identified in the question section.

it"s hard to see from a pic but I may be Bianco Venatino marble or porcelain tile look like stone