sodium fluoride

Sodium fluoride is an ionic compound with the formula NaF. This colourless solid is the main source of the fluoride ion in diverse applications. NaF is less expensive and less hygroscopic than KF, but otherwise the potassium salt is more widely used.
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General Information:
 Chemical Formula:
NaF
 Composition:
(Molecular Weight = 41.99 gm)
Sodium 54.75 % Na
Fluorine 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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Noun
1. a colorless crystalline salt of sodium (NaF) used in fluoridation of water and to prevent tooth decay
(hypernym) salt