Villiaumite Mineral Data

Villiaumite Mineral Data +

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General Villiaumite Information

Chemical Formula:

NaF

Composition:

Molecular Weight = 41.99 gm

Sodium 54.75 % Na 73.81 % Na₂O

Fluorine 45.25 % F 45.25 % F

- % F -19.05 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaF

Environment:

In nepheline-syenite composition rocks.

IMA Status:

Valid Species (Pre-IMA) 1908

Locality:

Islands of Los, French Guina. Link to MinDat.org Location Data.

Name Origin:

Named after the French traveller, Villium.

Synonym:

ICSD 24443

PDF 36-1455

Sodium Fluoride

Villiaumite Image

Images:

Villiaumite Griceite

Comments: White aggregates of griceite with pinkish villiaumite.
Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Qu?bec, Canada. Scale: Picture size 3.5 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Villiaumite Naujakasite

Comments: Greenish-gray crystals of naujakasite with red villiaumite.
Location: Narsaq river, Kvanefjeld Mt., Il?maussaq massif, Greenland. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Villiaumite Aplowite

Comments: Pink aplowite laths intergrown with lustrous, red, massive villiaumite.
Location: Mt Rasvumchorr, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: 20x19x18 mm.
© John Betts - Fine Minerals

Images:

Villiaumite

Comments: Nearly opaque crystalline villiaumite cleavage.
Location: Mount Kukisvumchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Villiaumite Crystallography

Cell Dimensions:

a = 4.631, Z = 4; V = 99.32 Den(Calc)= 2.81

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.319(1), 1.639(0.6), 1.338(0.17),

Crystal Structure:

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Deshpande V T , Acta Crystallographica , 14 (1961) p.794-794, Thermal expansion of sodium fluoride and sodium bromide, Note: T = 29.6 C, rocksalt structure

View Additional jPOWD Structure files for Villiaumite
[1] [2] [3] [4] [5] [6] [7]

Physical Properties of Villiaumite

Cleavage:

[100] Perfect, [010] Perfect, [001] Perfect

Color:

Colorless, Dark red, Orange brown, Pink.

Density:

2.79 - 2.8, Average = 2.79

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

2.5 - Finger Nail

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

pinkish white

Optical Properties of Villiaumite

Gladstone-Dale:

CI meas= 0.269 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.273 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1174,KPDmeas= 0.1181,KC= 0.1615

Optical Data:

Isotropic, n=1.33.

Calculated Properties of Villiaumite

Electron Density:

r_electron=2.66 gm/cc
note: r_Villiaumite=2.80 gm/cc.

Fermion Index

Fermion Index = 0
Boson Index = 1

Photoelectric:

PE_Villiaumite= 1.08 barns/electron
U=PE_Villiaumite x r_electron= 2.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Villiaumite is Not Radioactive

Villiaumite Classification

Dana Class:

9.1.1.3 (9)Anhydrous and Hydrated Halides

(9.1)where A X

(9.1.1)Dana Group

9.1.1.1 Halite NaCl F m3m 4/m 3 2/m

9.1.1.2 Sylvite KCl F m3m 4/m 3 2/m

9.1.1.3 Villiaumite NaF F m3m 4/m 3 2/m

9.1.1.4 Carobbiite KF F m3m 4/m 3 2/m

9.1.1.5 Griceite LiF F m3m 4/m 3 2/m

Strunz Class:

III/A.02-10 III - Halogenides

III/A - Simple halogenides, without water Metal : Halogen = 1 : 1

III/A.02 - Halite series Griceite - Bromargyrite

III/A.02-05 Griceite LiF F m3m 4/m 3 2/m

III/A.02-10 Villiaumite NaF F m3m 4/m 3 2/m

III/A.02-20 Carobbiite KF F m3m 4/m 3 2/m

III/A.02-30 Halite NaCl F m3m 4/m 3 2/m

III/A.02-40 Sylvite KCl F m3m 4/m 3 2/m

III/A.02-50 Chlorargyrite AgCl F m3m 4/m 3 2/m

III/A.02-60 Bromargyrite AgBr F m3m 4/m 3 2/m

Other Villiaumite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Villiaumite

NaF
Dana No: 9.1.1.3 Strunz No: III/A.02-10
Locality:

Notes: