Vitrified tiles (26x26) are made by mixing silica and clay to form a non porous tile with glassy texture. The main categories of Vitrified tiles would be Vitrified porcelain tiles, Vitrified ceramic tiles, marbonite vitrified tiles and marble vitrified tiles. Basic difference is that vitrified tiles are actually one kind of ceramic tile. But these are made after vitrification process and go through high level of refining generating glass kind of effect while ceramic tiles are made out of natural biodegradable and recyclable materials. Sizes : 24x24 26x26 32x32