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. The red color is due to a broad absorption peaking at 512 nm. It is a result of radiation damage to the crystal.
Hardness:
2 - 2.5
Density:
2.81 g/cm³
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Properties
Characteristics
Common Questions
General Info About Villiaumite
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Physical Properties of Villiaumite
Colors
Dark carmine-red, dark red, light orange, pink
Streak
White
Hardness
2 - 2.5 , Extremely soft
Density
2.81 g/cm³, Normal Weight
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Chemical Properties of Villiaumite
Formula
NaF
Elements listed
F, Na
Optical Properties of Villiaumite
Refractive Index
1.328-1.332
Pleochroism
Yellow to pink/deep carmine
Optical Character
Isotropic
Characteristics of Villiaumite
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Formation of Villiaumite
It occurs in nepheline syenite intrusives and in nepheline syenite pegmatites. It occurs associated with aegirine, sodalite, nepheline, neptunite, lamprophyllite, pectolite, serandite, eudialyte, ussingite, chkalovite and zeolites. It has been reported from Minas Gerais, Brazil; Mont Saint-Hilaire, Quebec, Canada; the Ilimaussaq complex of Greenland; Lake Magadi, Kenya; Windhoek District, Namibia; the Fen Complex, Telemark, Norway; the Khibiny and Lovozero Massifs, Kola Peninsula, Russia; Porphyry Mountain, Boulder County, Colorado and Point of Rocks Mesa, Colfax County, New Mexico, US. It was first described in 1908 for an occurrence in Los Islands, Guinea and named after the French explorer, Maxime Villiaume.
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