Villiaumite
![](/Images/godic/202502/19/Villiaumite1_-_Poudrette_quarry,_Mont_Saint-Hilaire,_Quebec,_Canada4748.jpg")
![Villiaumite, (field of view 7.1 x 4.7 mm), Poudrette quarry, Mont Saint-Hilaire, Quebec, Canada](/Images/godic/202502/19/Villiaumite2_-_Poudrette_quarry,_Mont_Saint-Hilaire,_Quebec,_Canada4748.jpg")
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.