Structure, General Properties, Occurrence
Sodium fluoride is an ionic compound, dissolving to give separated Na+ and F− ions. Like sodium chloride, it crystallizes in a cubic motif where both Na+ and F− occupy octahedral coordination sites; its lattice spacing, approximately 462 pm, is somewhat smaller than that of sodium chloride.
The mineral form of NaF, villiaumite, is moderately rare. It is known from plutonic nepheline syenite rocks.
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