How are engineered stones like Silestone, Ceasarstone & Cambria made?

They are made of approximately 94 percent stone particles (this is how they are able to claim to be stone or have qualities) and 6 percent plastic resin. Crushed granite, quartz, mica and feldspar (usually from a granite quarries stock that is too brittle to be cut into slabs) are mixed with a resin and pressed into slabs or countertops.