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Metathenardite

Formula:
Na
 
2
SO
 
4
Colour:Colourless (fresh)


A name applied to a high-temperature, possible hexagonal polymorph of Na2SO4. Needs further study and formal naming (?).

Originally reported from Mt. Pelée, Martinique, Lesser Antilles, French West Indies.

Classification of Metathenardite

IMA status:Hypothetical Mineral
Nickel-Strunz 10th (pending) edition ID:7.AC.30

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations
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Physical Properties of Metathenardite

Colour:Colourless (fresh)

Chemical Properties of Metathenardite

Formula:
Na
 
2
SO
 
4
All elements listed in formula:Na, O, S
Analytical Data:Breaks down to opaque white polymorphs of thenardite upon cooling and standing.
Relationship of Metathenardite to other Species
Related Minerals - Nickel-Strunz Grouping):

- + 
7.AC.05Vanthoffite
Na
 
6
Mg(SO
 
4
)
 
4
7.AC.10Efremovite
(NH
 
4
)
 
2
Mg
 
2
(SO
 
4
)
 
3
7.AC.10Langbeinite
K
 
2
Mg
 
2
(SO
 
4
)
 
3
7.AC.10Manganolangbeinite
K
 
2
Mn
 
2
(SO
 
4
)
 
3
7.AC.15Yavapaiite
KFe(SO
 
4
)
 
2
7.AC.15Eldfellite
NaFe
3+
 
(SO
 
4
)
 
2
7.AC.20Godovikovite
NH
 
4
(Al,Fe)(SO
 
4
)
 
2
7.AC.20Sabieite
NH
 
4
Fe(SO
 
4
)
 
2
7.AC.25Thenardite
Na
 
2
SO
 
4
7.AC.35Aphthitalite
(K,Na)
 
3
Na(SO
 
4
)
 
2
Other Information
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Metathenardite
Reference List:Lacroix (1905) Bulletin de la Société française de Minéralogie: 23: 65.



Palache, C., Berman, H., & Frondel, C. (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: 407.


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    Localities for Metathenardite
    






    


    

    
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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.

    French West Indies
     
    

    • Martinique
    
    		Palache, Charles, Harry Berman & Clifford Frondel (1951), Dana's System of Mineralogy, 7th edition, Volume 2: 407.
    Iceland
     
    

    • Vestmannaeyjar archipelago (Westman islands)
    

      • Heimaey island
    

        • Heimaey
    
    		Mitolo, D., Garavelli, A., Pedersen, L., Balić-Žunić, T., Jakobsson, S.P., Vurro, F. (2008): Mineralogy of actually forming sublimates at Eldfell Volcano, Heimaey (Vestmannaeyjar archipelago), Iceland. Plinius, 34, 322.
    

    


    

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