With kidney disease, potassium levels may need to be monitored and a low-potassium diet instituted., Sodium works along with chloride to maintain fluid balance outside the cells. 2017;2017:4179326. doi:10.1155/2017/4179326. Minerals, like vitamins, are necessary for the proper functioning of our bodies. Recall that a mineral is defined as naturally occurring. The three main rock types are igneous, sedimentary, and metamorphic. Our nutrition guide can help you get on the right track. Unlike ores these minerals are not limited only to metals. Pale feldspar (albite) with dark tourmaline (schorl) from Bobruvka, Czech republic. //