Hi. It is White Macaubas quartzite. These days, some lots are like this one... with pristine veining and very white color, but they are more rare than they used to be. Others are very dishwater gray with fuzzy veining, and that is the norm. You will pay a premium for the very white with clear grey/black veining, and you will want to allocate time to find it... these materials flow through the warehouses and fabricators in waves, and you just have to hit the right time and place to get something as beautiful as this piece. There is nothing else quite like premium White Macaubas, and its resistance characteristics are the best of any white quartzite I have seen (with none more white except the ones that look more like crystal ice). If you want the best chance of finding the best stone as quickly as possible, call Tara at Stone Source in Washington, DC at 202-265-5900. Stone Source maintains stock in warehouses in major cities around the country, and she can get you to the best White Macaubas available on the market anywhere. Stone Source curates their stone like no other distributor, and they can send your slabs of choice to any fabricator you like, anywhere. Thank you for your interest.