Create a seamless texture suitable for architectural modeling. The texture should depict a grey stone in a bookleaf pattern. The stones should be uniformly grey, with subtle variations in shade to mimic natural stone. The bookleaf pattern should be clearly visible, with each stone slab displaying a mirrored grain pattern, resembling the pages of an open book. The overall appearance should be realistic, with fine details in the stone's texture, including slight imperfections, veins, and a natural grain. Ensure the texture is seamless, so it can be tiled without visible edges.