Countertops take a lot of daily abuse, and in a coastal kitchen, humidity and moisture add another layer to consider. Here's how quartz vs granite vs onyx stacks up for a Peninsula home. Quartz: Low Maintenance, Consistent Look Quartz is engineered stone, which means it's non-porous and doesn't need sealing the way natural stone does. That makes it especially forgiving in a humid coastal kitchen since there's no sealant to maintain or reapply over time. It also comes in very