Tags: Chemical Substance, Mineral.
Villiaumite is a rare halide mineral composed of sodium fluoride NaF. It is very soluble in water and some specimens fluoresce under long and short wave ultraviolet light. It has a Mohs hardness of 2.5 and is usually red pink or orange in color. It is toxic to humans and should be handled with care.The red color is due to a broad absorption peaking at 512 nm. It is a result of radiation damage to the crystal.
