Phosphate rock is a naturally occurring, sedimentary rock that contains high levels of phosphate minerals. It is primarily used as a source of phosphate for fertilizers and various industrial chemicals. There are several synonyms for phosphate rock, including phosphorite, rock phosphate, and apatite. Phosphorite is often used in reference to the raw material, while rock phosphate typically refers to the processed product. Apatite is the mineral that makes up most phosphate rock deposits, and it is commonly found in igneous and metamorphic rocks. Other lesser-known synonyms for phosphate rock include guano, bone phosphate of lime, and coprolite. Regardless of the name used to describe it, phosphate rock plays an important role in global food production and environmental sustainability.