Villiaumite is a mineral composed of
sodium fluoride, NaF. It is 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. Named after the French traveller, Villium.
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General Information:
Chemical Formula:
NaF
Composition:
(Molecular Weight = 41.99 gm)
Sodium 54.75 %
NaFluorine 45.25 %
F Empirical Formula:
NaF
Environment:
In nepheline-syenite composition rocks.
Locality:
Islands of Los, French Guina.
Name Origin:
Named after the French traveller, Villium.
Physical Properties:
Cleavage:
[100] Perfect, [010] Perfect, [001] Perfect
Color:
colorless, dark red, orange brown, or pink.
Density:
2.79 - 2.8, Average = 2.79
Diaphaniety:
Transparent
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Granular - Generally occurs as anhedral to subhedral crystals in matrix.,
Hardness:
2.5 - Finger Nail
Luminescence:
Fluorescent.
Luster:
Vitreous (Glassy)
Streak:
pinkish white
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