One of our design challanges on a recent project was trying to match the tile laying of White Thassos tile to the counter top for the custom bathroom vanity.  There were three choices: a White Thassos Marble countertop that is extremely expensive (possibly $8K for the materials alone), a Carrera like Marble countertop (much more reasonably priced but would not match the shade of white), or a Quartz product such as a Caesar Stone Countertop, Silestone or similar product. Unfortunately, none of these options had the right color of white; all were too pigmented. However, there is a glass product available from China that exactly matches White Thassos. The raw material costs about a 10th as much, so the final product is reasonably priced.   The material comes in 2 and 3 cm thicknesses and is locally available from the importer though you have to buy a whole slab in order to cut your vanity top which means you have enough left over for two more tops when you're done.