NPT StoneScapes® Mini Pebbles BLACK MINI #228 Black Pool Finish Parent Kit. StoneScapes Mini Black pool finish creates deep dark green water color that can look gold in very shallow water and is comprised of black pigmented white Portland cement and natural black quartz pebble aggregates. Some naturally occurring seashell can be seen in this pebble mix which comes from the beaches of Baja California. The beauty of this finish comes from the shade and color variations inherent in natural materials.