I received this from a relative. I don't know much about it, so I don't have many details. The surface is smooth. It has a marble-like pattern. If you are knowledgeable and interested, please feel free to inquire. If you would like additional images, please comment. Thank you. I am also selling other Suiseki (water stones) ↓ #Yun'sDeclutteringGoods A beautiful decorative item characterized by the diverse colors and complex patterns of natural stone. - Material: Natural stone - Color: Multicolor with blues, greens, and reds - Shape: Irregular, polished surface - Pattern: Intricate patterns with speckles and swirls Thank you for looking.