Quartz Countertops are made of engineered stone consisting of 90-93% crushed up quartz and 7-10% resins, other binders, and dyes. The quartz-to-resin ratio differs depending on the quality of the quartz slabs produced by a countertop brand. Quartz Countertops are popular for kitchens and bathrooms due to being durable, maintenance-free, and having strong resistance to scratching and staining.