Island Tops Viscon White Granite Kitchen Countertops Viscon White granite is a fine-grained Precambrian gneiss (paragneiss) with deep coarse veins, ranging from off-white to nearly white. This type of stone can be classified as granite on a global scale, but in the context of European standards, it must be classified as gneiss. We can cut slabs, tiles, and cut-to-size items, among other things. Please contact our sales department if you require a custom size.