Granite is a natural stone, while quartz is a man-made material that uses the strongest part of granite-natural quartz.
Man-made Quartz derives its name from the natural mineral quartz which comprises about 95% of its make-up and then about 5% polymer resins. The combination of strong natural quartz gives quartz countertops great durability while the resins help to make the product non-porous (unlike natural stones ie: Granite). Quartz is typically more consistent in pattern and offers a wide range of colors, patterns, styles, and brands to choose among. It is scratch, stain, and heat resistant (but not heat proof! Trivets recommended). Pricing will vary among quartz brands and styles. The brand, along with the popularity of a color, and the complexity of its design will influence the raw slab price from the manufacturer. Quartz will typically range from low/mid-range to high price points.