The MIR Alaska 12" x 12.2" Thassos & Shell Chevron Mosaic. Usually used to describe a variety of white marble that comes from the Greek island of Thassos, Thassos marble is prized for its brilliance and purity. The word "chevron" refers to a V-shaped design that gives the mosaic more depth and visual appeal. Adding shell details to the design makes it much more visually appealing and could even evoke a natural or coastal vibe. This kind of mosaic tile is frequently utilized as accent pieces in a variety of interior design projects or in bathrooms and kitchens.