It seems like you're describing a particular material, possibly a type of stone such as marble, granite, or another natural stone used in interior design or architecture. The description evokes an image of a dark grey background crisscrossed with distinct, lighter colored veins that give it a luminous quality. This kind of material could be sought after for various applications such as flooring, wall cladding, countertops, and decor elements, offering a luxurious and dynamic aesthetic to any space. If you need more details or specific help around this type of material or its applications, feel free to ask!