Both quartz and granite are heavy, durable materials used in countertops. On a scale of hardness, quartz ranks just above granite, which can be attributed to its density and weight.
Thickness of a quartz or granite countertop is the biggest contributor to its overall weight. A 3/4-inch slab of granite weighs around 12 to 13 lbs. per square foot. 1 1/4-inch granite slabs weigh around 18 to 19 lbs. per square foot. Depending on thickness, quartz countertops can weigh up to 30 lbs. per square foot.
Quartz is less porous material than granite, which means food and fluids are less likely to seep into it. Both materials are naturally occurring, but quartz needs more levels of engineering and manipulation to be produced into a flat, level countertop.
Granite countertops need to have a sealant applied to them annually to curb staining and bacterial growth. Quartz countertops are more dense and never need to be sealed.
Since both materials are quite heavy, installing granite or quartz countertops should be left to qualified professionals. A quartz or granite countertop can weigh several hundred pounds depending on length, width and thickness.
Naturally occurring granite has pits and spaces within it. Quartz is engineered without pits and spaces. Perhaps the only downfall to quartz countertops is the lack of options when it comes to appearance. They may be harder, but they do not offer the almost endless color and pattern variety associated with granite.