This 100% natural quartz finish combines one of nature’s hardest minerals with a specially engineered admixture Pebble Edge® that fortifies the cement. Luna Quartz® looks like traditional plaster but is much more durable. Galaxy is made up of small black quartz pebbles. The watercolor hue cast by black bottom pools can be either blue or green. Because of the intense color, they are highly influenced by their surroundings and sunlight. Small random white pebbles are inherent in this product.