Deep Blue (#195499) is a versatile stone that can be used both indoors (in kitchens and bathrooms) and outdoors (in paving patios and gardens). Quartzite is a product of sandstone, and is found in various colors that range from gray to white. It is so strong, that it is often used in construction of walls and floors, and is commonly used as railroad track ballast. Because of its stunning beauty, it is also commonly used as decoration. Our Deep Blue (#195499) is a popular choice for those looking to add beauty to their home, while still maintaining its durability.