RbCl, or rubidium chloride, is a chemical compound made up of the elements rubidium and chlorine. It appears as a white crystalline solid and is highly soluble in water. RbCl is often used in laboratories and various industrial applications, including the production of rubidium metal and in certain types of chemical reactions. In nature, RbCl can be found in mineral deposits and is typically obtained through the extraction of rubidium from minerals like lepidolite. It is also used in some medical applications, such as in nuclear medicine for imaging and treatment purposes.