Ionic crystal

An ionic crystal is a crystal which consists of ions bound together by their electrostatic[?] attraction. Examples of such crystals are the alkali halides, including potassium fluoride, potassium chloride, potassium bromide, potassium iodide, sodium fluoride, and other combinations of sodium, caesium, rubidium, or lithium ions with fluoride, bromide, chloride or iodide ions. Many other types of ionic crystals are known.