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Villiaumite

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Aris Quarries (Ariskop Quarry; Railway Quarry), Aris, Windhoek, Windhoek District, Khomas Region, Namibia
© Bill Lechner

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Formula:
NaF
System:IsometricColour:Dark carmine-red, dark ...
Hardness:2 - 2½
Name:Named after Maxime Villiaume, French explorer and officer in the colonial artillery corps stationed in northern Madagascar, for his help in the acquisition of mineral and rock collections from Madagascar and Guinea. The species was first found in his collection.


Halite Group

Classification of Villiaumite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:3/A.02-10
Strunz 9th edition ID:3.AA.
Nickel-Strunz 10th (pending) edition ID:3.AA.20

3 : HALIDES
A : Simple halides, without H2O
A : M:X = 1:1, 2:3, 3:5, etc.
Dana 8th edition ID:9.1.1.3

9 : NORMAL HALIDES
1 : AX
Hey's CIM Ref.:8.1.2

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
1 : Halides of the alkali metals and ammonium
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Type Occurrence of Villiaumite

Type Locality:Rouma Island (Roume; Roma; Ruma), Los Archipelago (Los Islands), Guinea
Year of Discovery:1908
Geological Setting of type material:Small miarolytic cavities in nepheline syenite.

Occurrences of Villiaumite

Geological Setting:Alkalic rocks.

Physical Properties of Villiaumite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Dark carmine-red, dark red, light orange, pink
Streak:White
Hardness (Mohs):2 - 2½
Tenacity:Brittle
Cleavage:Perfect
On {001}.
Parting:Translation gliding with T{011, t[011], and probably also T{001}, t[011].
Density (measured):2.79 g/cm3
Density (calculated):2.81 g/cm3

Crystallography of Villiaumite

Crystal System:Isometric
Class (H-M):m3m (4/m 3 2/m) - Hexoctahedral
Space Group:Fd3m (F41/d 3 2/m)
Cell Parameters:a = 4.63Å
Unit Cell Volume:V 99.25 ų (Calculated from Unit Cell)
Morphology:Massive, granular.

Optical Data of Villiaumite

Type:Isotropic
Pleochroism:Strong
Comments:E = yellow
O = pink to deep carmine
Comments:Weak anomalous birefringence.

Chemical Properties of Villiaumite

Formula:
NaF
Essential elements:F, Na
All elements listed in formula:F, Na
Analyical Data:Slightly water soluble.
Relationship of Villiaumite to other Species
Related Minerals - Nickel-Strunz Grouping):

- + 
3.AA.05Marshite
CuI
3.AA.05Miersite
(Ag,Cu)I
3.AA.05Nantokite
CuCl
3.AA.10Iodargyrite
AgI
3.AA.10Tocornalite
(Ag,Hg)I
3.AA.15Bromargyrite
AgBr
3.AA.15Chlorargyrite
AgCl
3.AA.20Carobbiite
KF
3.AA.20Griceite
LiF
3.AA.20Halite
NaCl
3.AA.20Sylvite
KCl
3.AA.25Salammoniac
NH
 
4
Cl
3.AA.25Lafossaite
Tl(Cl,Br)
3.AA.30Calomel
Hg
 
2
Cl
 
2
3.AA.30Kuzminite
Hg
 
2
(Br,Cl)
 
2
3.AA.30Moschelite
Hg
 
2
I
 
2
3.AA.35Neighborite
NaMgF
 
3
3.AA.40Chlorocalcite
KCaCl
 
3
3.AA.45Kolarite
PbTeCl
 
2
3.AA.50Radhakrishnaite
PbTe
 
3
(Cl,S)
 
2
3.AA.55Challacolloite
KPb
 
2
Cl
 
5
3.AA.60Hephaistosite
TlPb
 
2
Cl
 
5
Related Minerals - Hey's Index Grouping:

- + 
8.1.1Griceite
LiF
8.1.3Halite
NaCl
8.1.4Hydrohalite
NaCl·2H
 
2
O
8.1.5Carobbiite
KF
8.1.6Sylvite
KCl
8.1.7Salammoniac
NH
 
4
Cl
Other Names for Villiaumite
Other Languages:
German:Villiaumit
Russian:Виллиомит
Spanish:Villiaumita
Other Information
Fluorescence in UV light:None.
Thermal Behaviour:Becomes colourless and isotropic whe heated to 300°.
Other Information:Soluble in water.
Health Warning:Poisonous! Do not lick or ingest. Wash hands after handling.
References for Villiaumite
Reference List:Lacroix (1908), Comptes Rendus Hebdomadaires des Séances de l’ Académie des Sciences de Paris: 146: 213.



Davey (1923) Physical Review, a Journal of Experimental and Theoretical Physics: 21: 143.



Davey (1921) Physical Review, a Journal of Experimental and Theoretical Physics: 



Barth and Lunde (1927) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 57.



Buerger (1930), American Mineralogist: 15: 64.



Frondel, C. (1940) American Mineralogist: 25: 91.



Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 10.



American Mineralogist (1970): 55: 126-134.



Neues Jahrbuch für Mineralogie, Monatshefte (1981): 111.


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    Localities for Villiaumite
    






    


    

    
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    (TL) indicates type locality.  ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.

    Brazil
     
    

    • Southeast Region
    

      • Minas Gerais
    

        • Poços de Caldas
    
    		Min Rec  36:3 pp275-280
    Canada
     
    

    • Québec
    

      • Rouville Co.
    

        • Mont Saint-Hilaire
    
    		Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
    


      • Verchères Co.
    

        • Varennes & St-Amable
    

          • Saint-Amable sill
    
    		Mineralogical Record: 29: 83.
    Greenland
     
    

    • Kitaa (West Greenland) Province
    

      • Narsaq
    

        • Ilimaussaq complex
    

          • Kuannersuit (Kvanefjeld) plateau
    

            • Kvanefjeld Uranium deposit
    
    		-	Petersen, O., Khomyakov, A., Soerensen, H. (2001): Natrophosphate from the Ilimaussaq alkaline complex South Greenland, South Greenland, Geology of Greenland Survey Bulletin, 190, 139-141
    





Khomyakov, A., Soerensen, H. (2001): Zoning in Steenstrupine-(Ce) from the Ilimaussaq alkaline complex, South Greenland, Geology of Greenland Survey Bulletin 190, 109-118
    






              • Kvanefjeld tunnel
    
    		Peterson, O., Johnson, O. Leonardsen, E., Roensbo, J. (1984): Kvanefjeldite a new mineral species from the Ilimaussaq alkaline complex, South West Greenland, Canadian Mineralogist, Vol. 22, 465-467
    Guinea
     
    

    • Los Archipelago (Los Islands)
    

    

C.R.Acad.Sci. Paris (1908) 146, 213; Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume II, John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 10.
    Kenya
     
    

    • Rift Valley Province
    

      • South Rift Valley
    

    Namibia
     
    

    • Khomas Region
    

      • Windhoek District
    

        • Windhoek
    

          • Aris
    
    		von Knorring, O., Petersen, O. V. Karup-Moeller, S., Leonardsen, E. S. and Condliffe, E. (1992): Tuperssuatsiaite, from Aris phonolite, Windhoek, Namibia. Neues Jahrbuch für Mineralogie Monatsh., 1992, 145-152; Petersen, O.V., Fockenberg, T., Toft, P.C. & Rattay, M. (1997): Natrophosphate from the Aris phonolites, Windhoek, Namibia. Neues Jahrbuch für Mineralogie, Monatshefte 1997, 511-517. ; [http://www.koeln.netsurf.de/~w.steffens/aris.htm]
    Norway
     
    

    • Telemark
    

      • Nome
    
    		R. Åmli (1974, pers. com.); Neumann (1985, p. 48).
    Russia
     
    

    • Northern Region
    

      • Murmanskaja Oblast'
    

        • Kola Peninsula
    

          • Khibiny Massif
    

    




[World of Stones 95:5-6, p64]
    





            • Kukisvumchorr Mt
    
    		[World of Stones 95:5-6, p64]
    




ZVMO 135(1),38-48(2006)
    





    




Am Min 79:1011
    






    





    





            • Vuonnemiok River Valley
    

    





            • Yukspor Mt
    

    




          • Lovozero Massif
    
    		[World of Stones 95:5-6, p64]
    




[World of Stones 95:5-6, p64]
    





            • Kedykverpakhk Mt
    
    		American Mineralogist: 90: 1467-1468.
    USA
     
    

    • Colorado
    

      • Boulder Co.
    

        • Jamestown District
    
    		Minerals of Colorado (1997) E.B. Eckels
    

    • New Mexico
    

      • Colfax Co.
    

        • Springer
    

          • Point of Rocks Mesa (Pecks Mesa)
    
    		Rocks & Min.:60:229.
    

    


    

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