It sounds like you are describing a type of Bianco Dolomite ceramic slab, which is recognized for its bright, pure white color enhanced by subtle shading and fine dark veining. This material offers a minimalist, refined aesthetic that combines effortlessly with other porcelain stoneware finishes to create distinctive and elegant spaces. It is suitable for a variety of design applications, such as countertops, flooring, and wall cladding, providing both beauty and functionality.