Salts containing fluoride are numerous and adopt myriad structures. Typically the fluoride anion is surrounded by four or six cations, as is typical for other halides. Sodium fluoride and sodium chloride adopt the same structure. For compounds containing more than one fluoride per cation, the structures often deviate from those of the chlorides, as illustrated by the main fluoride mineral fluorite (CaF) where the Ca ions are surrounded by eight F centers. In CaCl, each Ca ion is surrounded by six Cl centers. The difluorides of the transition metals often adopt the rutile structure whereas the dichlorides have cadmium chloride structures.