Like Quartz, Sintered Stone is a manufactured product made from a base of natural stone. Depending on the manufactuer, Quartz has a base of 88%-95% natural quartz stone, mixed with pigments, polymers and resins which is what bonds the slab together.
Sintered Stone is different in that it is made entirely from natural materials which are formed into incredibly strong and durable slabs which have countless applications. This process is called sintering.