Villiaumite Mineral Data + Say VILLIAUMITE


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General Villiaumite Information
Help on Chemical Formula: Chemical Formula: NaF
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: NaF
Help on Environment: Environment: In nepheline-syenite composition rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1908
Help on Locality: Locality: Islands of Los, French Guina. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the French traveller, Villium.
Help on Synonym: Synonym: ICSD 24443
  PDF 36-1455
  Sodium Fluoride
 

Villiaumite Image

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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
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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
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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
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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
Help on Cell Dimensions: Cell Dimensions: a = 4.631, Z = 4; V = 99.32 Den(Calc)= 2.81
Help on Crystal System: 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/Io): 2.319(1), 1.639(0.6), 1.338(0.17),
Click Here for Large Villiaumite Structure Window 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

Help on Cleavage: Cleavage: [100] Perfect, [010] Perfect, [001] Perfect
Help on Color: Color: Colorless, Dark red, Orange brown, Pink.
Help on Density: Density: 2.79 - 2.8, Average = 2.79
Help on Diaphaniety: Diaphaniety: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: pinkish white
 

Optical Properties of Villiaumite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Isotropic, n=1.33.
 

Calculated Properties of Villiaumite

Help on Electron Density: Electron Density:

relectron=2.66 gm/cc
note: rVilliaumite =2.80 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0
Boson Index = 1
Help on Photoelectric: Photoelectric:

PEVilliaumite = 1.08 barns/electron
U=PEVilliaumite x relectron= 2.87 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Villiaumite is Not Radioactive
 

Villiaumite Classification
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: 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 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (UofA) 11 -MinDAT 12 -MinMax(Deutsch) 13 -MinMax(English) 14 -Mineralienatlas (Deutsch) 15 -QUT Mineral Atlas 16 - WWW-MINCRYST 17 -École des Mines de Paris

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Villiaumite

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

 

Notes:

 
 
   
 
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