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Mendozite

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Formula:
NaAl(SO
 
4
)
 
2
· 11H
 
2
O
System:MonoclinicColour:Colourless (turns white ...
Hardness:3
Name:After the supposed type locality of St. Juan near Mendoza, Argentina.


Closely related to the members of the Alum Group.

Classification of Mendozite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:6/C.13-10
Nickel-Strunz 10th (pending) edition ID:7.CC.15

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations
Dana 8th edition ID:29.5.4.1

29 : HYDRATED ACID AND NORMAL SULFATES
5 : AB(XO4)2·xH2O
Hey's CIM Ref.:25.6.13

25 : Sulphates
6 : Sulphates of Al and Tl
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Type Occurrence of Mendozite

Type Locality:San Juan, Mendoza, Argentina
Year of Discovery:1868

Physical Properties of Mendozite

Diaphaneity (Transparency):Transparent
Colour:Colourless (turns white upon exposure); colourless in transmitted light.
Hardness (Mohs):3
Cleavage:Distinct/Good
{100}, good; {001} and {010}, indistinct.

Crystallography of Mendozite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Cell Parameters:a = 21.75Å, b = 9.1Å, c = 8.29Å
β = 92.47°
Ratio:a:b:c = 2.39 : 1 : 0.911
Unit Cell Volume:V 1,639.27 ų (Calculated from Unit Cell)
Morphology:Artificial crystals are prismatic [001] with large {100}; also pseudo-rhombohedral with {100} and {_211}. Fibrous masses.

Optical Data of Mendozite

Type:Biaxial (-)
RI values: nα = 1.449 nβ = 1.461 nγ = 1.463
2V:Measured: 56° , Calculated: 44°
Maximum Birefringence:δ = 0.014

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v distinct

Chemical Properties of Mendozite

Formula:
NaAl(SO
 
4
)
 
2
· 11H
 
2
O
Simplified for copy/paste:NaAl(SO4)2·11H2O
Essential elements:Al, H, Na, O, S
All elements listed in formula:Al, H, Na, O, S
Analytical Data:Soluble in water. Dehydrates and alters to white tamarugite.

Relationship of Mendozite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.CC.05Krausite
KFe(SO
 
4
)
 
2
· H
 
2
O
7.CC.10Tamarugite
NaAl(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.15Kalinite
KAl(SO
 
4
)
 
2
· 11H
 
2
O Not confirmed
7.CC.20Lonecreekite
(NH
 
4
)Fe
3+
 
(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.20Alum-(K)
KAl(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.20Alum-(Na)
NaAl(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.20Tschermigite
(NH
 
4
)Al(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.20Lanmuchangite
Tl
+
 
Al(SO
 
4
)
 
2
· 12H
 
2
O
7.CC.25Voltaite
K
 
2
Fe
2+
5
Fe
3+
3
Al(SO
 
4
)
 
12
· 18H
 
2
O
7.CC.25Zincovoltaite
K
 
2
Zn
 
5
Fe
3+
3
Al(SO
 
4
)
 
12
· 18H
 
2
O
7.CC.25Pertlikite
K
 
2
(Fe
2+
 
,Mg)
 
2
Mg
 
4
Fe
3+
2
Al(SO
 
4
)
 
12
· 18H
 
2
O
7.CC.25Ammoniomagnesiovoltaite
(NH
 
4
)
 
2
Mg
2+
5
Fe
3+
3
Al(SO
 
4
)
 
12
· 18H
 
2
O
7.CC.30Kröhnkite
Na
 
2
Cu(SO
 
4
)
 
2
· 2H
 
2
O
7.CC.35Ferrinatrite
Na
 
3
Fe(SO
 
4
)
 
3
· 3H
 
2
O
7.CC.40Goldichite
KFe(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.45Löweite
Na
 
12
Mg
 
7
(SO
 
4
)
 
13
· 15H
 
2
O
7.CC.50Blödite
Na
 
2
Mg(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.50Nickelblödite
Na
 
2
(Ni,Mg)(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.50Changoite
Na
 
2
Zn(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.50Zincblödite
7.CC.55Leonite
K
 
2
Mg(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.55Mereiterite
K
 
2
Fe(SO
 
4
)
 
2
· 4H
 
2
O
7.CC.60Boussingaultite
(NH
 
4
)
 
2
Mg(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.60Cyanochroite
K
 
2
Cu(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.60Mohrite
(NH
 
4
)
 
2
Fe(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.60Nickelboussingaultite
(NH
 
4
)
 
2
Ni(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.60Picromerite
K
 
2
Mg(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.65Polyhalite
K
 
2
Ca
 
2
Mg(SO
 
4
)
 
4
· 2H
 
2
O
7.CC.70Leightonite
K
 
2
Ca
 
2
Cu(SO
 
4
)
 
4
· 2H
 
2
O
7.CC.75Amarillite
NaFe(SO
 
4
)
 
2
· 6H
 
2
O
7.CC.80Konyaite
Na
 
2
Mg(SO
 
4
)
 
2
· 5H
 
2
O
7.CC.85Wattevilleite
Na
 
2
Ca(SO
 
4
)
 
2
· 4H
 
2
O (?)
Related Minerals - Hey's Index Grouping:

- +
25.6.1Rostite
Al(SO
 
4
)(OH) · 5H
 
2
O
25.6.2Jurbanite
Al(SO
 
4
)(OH) · 5H
 
2
O
25.6.3Khademite
Al(SO
 
4
)F · 5H
 
2
O
25.6.4Meta-aluminite
Al
 
2
(SO
 
4
)(OH)
 
4
· 5H
 
2
O
25.6.5Aluminite
Al
 
2
(SO
 
4
)(OH)
 
4
· 7H
 
2
O
25.6.6Meta-alunogen
Al
 
2
(SO
 
4
)
 
3
· 12H
 
2
O
25.6.7Alunogen
Al
 
2
(SO
 
4
)
 
3
· 17H
 
2
O
25.6.8Felsőbányaite
Al
 
4
(SO
 
4
)(OH)
 
10
· 4H
 
2
O
25.6.9Basaluminite
25.6.10Hydrobasaluminite
Al
 
4
(SO
 
4
)(OH)
 
10
· 12-36H
 
2
O
25.6.11Zaherite
Al
 
12
(SO
 
4
)
 
5
(OH)
 
26
· 20H
 
2
O
25.6.12Tamarugite
NaAl(SO
 
4
)
 
2
· 6H
 
2
O
25.6.14Alum-(Na)
NaAl(SO
 
4
)
 
2
· 12H
 
2
O
25.6.15Natroalunite
(Na,K)Al
 
3
(SO
 
4
)
 
2
(OH)
 
6
25.6.16Kalinite
KAl(SO
 
4
)
 
2
· 11H
 
2
O Not confirmed
25.6.17Alum-(K)
KAl(SO
 
4
)
 
2
· 12H
 
2
O
25.6.18Alunite
KAl
 
3
(SO
 
4
)
 
2
(OH)
 
6
25.6.19Natroalunite-2c
(Na,Ca
 
0.5
,K)Al
 
3
(SO
 
4
)
 
2
(OH)
 
6
25.6.20Tschermigite
(NH
 
4
)Al(SO
 
4
)
 
2
· 12H
 
2
O

Other Names for Mendozite

Synonyms:
Native Soda-AlumNatrumalaunSoda-Alum
Other Languages:
German:Natronalaun
Mendozit
Russian:Мендоцит
Spanish:Mendozita

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 Mendozite

Reference List:

- +
Thomson (1828) Annals Lyceum Natural History, New York: 3: 19 (as native Soda-Alum).

Dana, J.D. (1868) System of Mineralogy, 5th. Edition, New York.: 653.

Divers (1881) Chemical News and Journal of Industrial Science, London: 44: 218.

Soret (1884) Arch. sc. phys. nat. Genève: 11: 63.

Surganov (1909) Academy of Sciences St. Petersburg, Bull.: 3: 1057.

Keller (1935) American Mineralogist: 20: 537.

Bandy (1938) American Mineralogist: 23: 722.

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, 1124 pp.: 469.

Fang, J.H. and P.D. Robinson (1972): Crystal structures and mineral chemistry of double-salt hydrates: II. The crystal structure of mendozite, NaAl(SO4)2 •11H2O. Amer. Mineral., 37, 1082–1088.

Internet Links for Mendozite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mendozite details from Handbook of Mineralogy (PDF)
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  • Localities for Mendozite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (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.
    Argentina
     
    • Mendoza
    Am Min 57:1081 (1972)
    • San Juan
      • Iglesia Department
    Angelelli, V., Brodtkorb, M.K. de, Gordillo, C.E. y Gay, H.D. (1983). Las Especies Minerales de la República Argentina. Subsecretaría de Minería. Publicación Especial. 528 pp.
    Canada
     
    • British Columbia
      • Kamloops Mining Division
    Schmetzer, K. & Medenbach, O. (1983): Challantite from Cache Creek, British Columbia, Canada - a second occurrence. Neues Jahrbuch für Mineralogie, Monatshefte 1983, 158-162.
    Chile
     
    • Antofagasta Region
      • El Loa Province
        • Calama
          • Chuquicamata District
    R.B. Cook: "Famous mineal locality; Chuquicamata, Chile": Mineralogical Record, sept.-oct. 1973
    • Tarapacá Region
      • El Tamarugal Province
        • Pampa del Tamarugal
    Peter G. Seroka collection
    Germany
     
    • North Rhine-Westphalia
      • Ruhr Coal Mining area
        • Herne
    Weiss: "Mineralfundstellen, Deutschland West", 1990
    Hungary
     
    • Heves Co.
      • Mátra Mtns
        • Recsk
    ACTA MIN. PETR. Suppl. Tomus XXXVIII., 1997
    Szakáll & Jánosi: Minerals of Hungary, 1995
    Italy
     
    • Campania
      • Phlegrean Volcanic Complex
        • Naples Province
          • Phlegrean Fields
            • Pozzuoli
    http://70.1911encyclopedia.org/V/VO/VOLCANO.htm.
    • Sicily
      • Messina Province
        • Eolie Islands (Aeolian Islands)
          • Lipari
            • Vulcano Island
    PANICHI U. (1924): Contributo allo studio dei minerali dell'Isola di Vulcano. - Memorie della Società Italiana delle Scienze (detta dei XL) - serie 3 - 19, 3-55.
              • Porto Levante
    P.Forti, M.Panzica La Manna and A.Rossi (1994) The peculiar mineralogic site of the Alum cave (Vulcano, Sicily). Proceedings of the 7th International Symposium on Vulcanospeleology November 1994 p.35-44.
    Norway
     
    • Oppland
      • Ringebu
        • Fåvang
    Broch, O.A. (1931): Pickeringite from Fåvang. Norsk Geologisk Tidsskrift. 12: 117-121
      • Valdres
    Selbekk, R. S., Husdal, T. A. & Berg, H-J. (2010): Nye mineraler for Norge i 2010. Stein. 37 (4): 24-26
    Slovakia
     
    • Banská Bystrica Region
      • Žiar nad Hronom Co.
    Ďuďa R., 1993 : Die mineralien der Gold und Silber - lagersttäte von Kremnitz ( Kremnica) in der Slowakei. Mineralien Welt /Haltern,Nemecko/,5, s. 20 - 32
    USA
     
    • California
      • Amador Co.
        • Volcano
    Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 257, 259.
      • Napa Co.
        • Yountville
    Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 259.
      • San Bernardino Co.
        • Hidden Springs
    Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 259.
    • Colorado
      • Eagle Co.
        • Gilman District (Battle Mountain District; Red Cliff District)
    Minerals of Colorado (1997) E.B. Eckels
    • Georgia
      • Rabun Co.
    Minerals of Georgia: Their properties and occurrences. Robert Cook GGWRD Bull 92
    AmMin. 20:229
      • Callaway Co.
        • Fulton
    Rocks & Min., March 1998.
      • St. Louis Co.
    R&M 73:2 pp 98-117
    • Nevada
      • Esmeralda Co.
    NBMG Spec. Pub. 31 Minerals of Nevada
    • New Mexico
      • Guadalupe Co.
    Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
      • Torrance Co.
    Minerals of New Mexico 3rd ed.
    • Virginia
      • Chesterfield Co.
    Minerals of Virginia 1990 by R. V. Dietrich
    • Washington
      • Yakima Co.
        • Mount Adams
    Cannon, B. (1975): Minerals of Washington, p.120
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