Could the picture below be a sample of the product you have? I don't want to do an ad for the company, so I will give you a small excerpt from their description of this product. And guess what. It is called 'Black Coral'.
HanStone Quartz - Black Coral RS306
HanStone® offers the natural beauty of quartz with up to six times the strength and durability of granite. 93 percent of HanStone is mined quartz crystals, one of natures hardest materials. The quartz is combined with polyester resins and pigments to create the look of natural stone without the high-maintenance.