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.

Name Pronunciation:

Villiaumite + Pronunciation

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., Québec, 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., Ilímaussaq 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

Diaphaneity:

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, Short UV=red.

Luster:

Vitreous (Glassy)

Streak:

pinkish white

Optical Properties of Villiaumite

Optical Data:

Isotropic, n=1.33.

Calculated Properties of Villiaumite

Electron Density:

Bulk Density (Electron Density)=2.68 gm/cc
note: Specific Gravity of Villiaumite =2.81 gm/cc.

Fermion Index:

Fermion Index = 0
Boson Index = 1

Photoelectric:

PE_Villiaumite= 1.08 barns/electron
U=PE_Villiaumite x rElectron Density= 2.89 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Villiaumite is Not Radioactive

Villiaumite Classification

Dana Class:

09.01.01.03 (09)Anhydrous and Hydrated Halides

(09.01)where A X

(09.01.01)Halite Group

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

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

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

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

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

Strunz Class:

03.AA.20 03 - HALIDES

03.A - Simple Halides, Without H2O

03.AA -M:X = 1:1, 2:3, 3:5, etc.

03.AA.20 Carobbiite KF F m3m 4/m 3 2/m

03.AA.20 Griceite LiF F m3m 4/m 3 2/m

03.AA.20 Halite NaCl F m3m 4/m 3 2/m

03.AA.20 Sylvite KCl F m3m 4/m 3 2/m

03.AA.20 Villiaumite NaF F m3m 4/m 3 2/m

Other Villiaumite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990;www.saint-hilaire.ca) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Villiaumite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - CalTech Mineral Spectroscopy
7 - EUROmin Project
8 - Ecole des Mines de Paris
9 - GeoScienceWorld
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - Handbook of Mineralogy (UofA)
14 - MinDAT
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info
19 - WWW-MINCRYST

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Ask about Villiaumite here :
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Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Villiaumite Specimen Label here :

Villiaumite

NaF
Dana No: 09.01.01.03 Strunz No: 03.AA.20
Locality:

Notes: