Mendozite
A valid IMA mineral species - grandfathered
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About Mendozite
Formula:
NaAl(SO4)2 · 11H2O
Colour:
Colourless (turns white upon exposure); colourless in transmitted light.
Hardness:
3
Specific Gravity:
1.730
Crystal System:
Monoclinic
Name:
Named after the province of Mendoza, Argentina, that includes the supposed type locality of St. Juan.
Unique Identifiers
Mindat ID:
2643
Long-form identifier:
mindat:1:1:2643:3
GUID
(UUID V4):
(UUID V4):
27bc0b5b-0d4d-4869-8556-7a279757fe68
IMA Classification of Mendozite
Approved, 'Grandfathered' (first described prior to 1959)
Classification of Mendozite
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
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations
29.5.4.1
29 : HYDRATED ACID AND NORMAL SULFATES
5 : AB(XO4)2·xH2O
29 : HYDRATED ACID AND NORMAL SULFATES
5 : AB(XO4)2·xH2O
25.6.13
25 : Sulphates
6 : Sulphates of Al and Tl
25 : Sulphates
6 : Sulphates of Al and Tl
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Mz | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Mendozite
Transparency:
Transparent
Colour:
Colourless (turns white upon exposure); colourless in transmitted light.
Hardness:
3 on Mohs scale
Cleavage:
Distinct/Good
{100}, good; {001} and {010}, indistinct.
{100}, good; {001} and {010}, indistinct.
Density:
1.730 g/cm3 (Measured) 1.781 g/cm3 (Calculated)
Optical Data of Mendozite
Type:
Biaxial (-)
RI values:
nα = 1.449(1) nβ = 1.461(3) nγ = 1.463(3)
2V:
Measured: 56° (1), Calculated: 44°
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v distinct
Chemistry of Mendozite
Mindat Formula:
NaAl(SO4)2 · 11H2O
Crystallography of Mendozite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 21.75(3) Å, b = 9.11(1) Å, c = 8.30(1) Å
β = 92.28(5)°
β = 92.28(5)°
Ratio:
a:b:c = 2.387 : 1 : 0.911
Unit Cell V:
1,643.28 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Artificial crystals are prismatic [001] with large {100}; also pseudo-rhombohedral with {100} and {211}. Fibrous masses.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0000289 | Mendozite | Fang J H, Robinson P D (1972) Crystal structures and mineral chemistry of double-salt hydrates: II. The crystal structure of mendozite, NaAl(SO4)2.11H2O American Mineralogist 57 1081-1088 | 1972 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.50 Å | (100) |
4.76 Å | (85) |
4.58 Å | (65) |
4.15 Å | (50) |
3.60 Å | (35) |
2.644 Å | (35) |
10.9 Å | (30) |
Comments:
synthetic
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
45a : [Sulfates, arsenates, selenates, antimonates] | |
47a : [Near-surface hydration of prior minerals] | |
47b : [Sulfates and sulfites] | |
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
50 : Coal and/or oil shale minerals | <0.36 |
Stage 10b: Anthropogenic minerals | <10 Ka |
55 : Anthropogenic mine minerals | |
56 : Slag and smelter minerals (see also #51 and #55) |
Type Occurrence of Mendozite
Associated Minerals at Type Locality:
Reference:
Dana J D, Brush G J (1868) 677. Mendozite. in A System of Mineralogy, Fifth Edition, John Wiley and Sons (New York) 653-653
Synonyms of Mendozite
Other Language Names for Mendozite
Related Minerals - Strunz-mindat Grouping
7.CC. | Cobaltoblödite | Na2Co(SO4)2 · 4H2O |
7.CC. | Andychristyite | PbCu2+Te6+O5(H2O) |
7.CC. | Ammoniovoltaite | (NH4)2Fe2+5Fe3+3Al(SO4)12(H2O)18 |
7.CC.05 | Krausite | KFe(SO4)2 · H2O |
7.CC.10 | Tamarugite | NaAl(SO4)2 · 6H2O |
7.CC.15 | Kalinite | KAl(SO4)2 · 11H2O |
7.CC.20 | Lonecreekite | (NH4)Fe3+(SO4)2 · 12H2O |
7.CC.20 | Alum-(K) | KAl(SO4)2 · 12H2O |
7.CC.20 | Alum-(Na) | NaAl(SO4)2 · 12H2O |
7.CC.20 | Tschermigite | (NH4)Al(SO4)2 · 12H2O |
7.CC.20 | Lanmuchangite | Tl+Al(SO4)2 · 12H2O |
7.CC.25 | Voltaite | K2Fe2+5Fe3+3Al(SO4)12 · 18H2O |
7.CC.25 | Zincovoltaite | K2Zn5Fe3+3Al(SO4)12 · 18H2O |
7.CC.25 | Pertlikite | K2(Fe2+,Mg)2Mg4Fe3+2Al(SO4)12 · 18H2O |
7.CC.25 | Ammoniomagnesiovoltaite | (NH4)2Mg2+5Fe3+3Al(SO4)12 · 18H2O |
7.CC.25 | Magnesiovoltaite | K2Mg5Fe3+3Al(SO4)12 · 18H2O |
7.CC.30 | Kröhnkite | Na2Cu(SO4)2 · 2H2O |
7.CC.35 | Ferrinatrite | Na3Fe(SO4)3 · 3H2O |
7.CC.40 | Goldichite | KFe(SO4)2 · 4H2O |
7.CC.45 | Löweite | Na12Mg7(SO4)13 · 15H2O |
7.CC.50 | Blödite | Na2Mg(SO4)2 · 4H2O |
7.CC.50 | Nickelblödite | Na2(Ni,Mg)(SO4)2 · 4H2O |
7.CC.50 | Changoite | Na2Zn(SO4)2 · 4H2O |
7.CC.55 | Leonite | K2Mg(SO4)2 · 4H2O |
7.CC.55 | Mereiterite | K2Fe(SO4)2 · 4H2O |
7.CC.60 | Boussingaultite | (NH4)2Mg(SO4)2 · 6H2O |
7.CC.60 | Cyanochroite | K2Cu(SO4)2 · 6H2O |
7.CC.60 | Mohrite | (NH4)2Fe(SO4)2 · 6H2O |
7.CC.60 | Nickelboussingaultite | (NH4)2Ni(SO4)2 · 6H2O |
7.CC.60 | Picromerite | K2Mg(SO4)2 · 6H2O |
7.CC.60 | Nickelpicromerite | K2Ni(SO4)2 · 6H2O |
7.CC.60 | Katerinopoulosite | (NH4)2Zn(SO4)2 · 6H2O |
7.CC.65 | Polyhalite | K2Ca2Mg(SO4)4 · 2H2O |
7.CC.70 | Leightonite | K2Ca2Cu(SO4)4 · 2H2O |
7.CC.75 | Amarillite | NaFe(SO4)2 · 6H2O |
7.CC.80 | Konyaite | Na2Mg(SO4)2 · 5H2O |
7.CC.85 | Wattevilleite | Na2Ca(SO4)2 · 4H2O (?) |
7.CC.85 | Xocolatlite | Ca2Mn4+2(Te6+O6)2 · H2O |
7.CC.90 | Eckhardite | (Ca,Pb)Cu2+Te6+O5(H2O) |
Other Information
Notes:
Soluble in H2O
Special Storage/
Display Requirements:
Display Requirements:
on exposure dehydrates to tamarugite
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Mendozite
mindat.org URL:
https://www.mindat.org/min-2643.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Mendozite
Localities for Mendozite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Argentina (TL) | |
| Am Min 57:1081 (1972) |
| Angelelli et al. (1983) |
Australia | |
| Simpson Mineral Collection of the ... +1 other reference |
Canada | |
| Schmetzer et al. (1983) |
Cape Verde | |
| Silva et al. (2019) |
Chile | |
| Cook (1978) |
| Peter G. Seroka collection |
Costa Rica | |
| Ulloa et al. (2018) |
Germany | |
| Weiß (1990) |
| Bender et al. (1994) |
Hungary | |
| ACTA MIN. PETR. Suppl. Tomus XXXVIII. |
Szakáll et al. (1996) | |
Italy | |
| 70.1911encyclopedia.org (n.d.) |
| PANICHI U. (1924) |
| P.Forti (1994) |
Japan | |
| Divers (1881) |
New Zealand | |
| Johnstone (1979) |
Nicaragua | |
| Hynek et al. (2013, March) |
| Hynek et al. (2013) |
Norway | |
| Selbekk et al. (2010) |
| Broch (1931) |
Poland | |
| Cu +2 other references |
Senegal | |
| Montoroi (1995) |
Slovakia | |
| Ďuďa (1993) |
USA | |
| Murdoch (1966) |
| Murdoch et al. (1966) |
| Murdoch et al. (1966) |
| Eckel et al. (1997) |
| Cook (1978) |
AmMin. 20:229 | |
| Rocks & Min. |
| Sherwood et al. (1998) |
| Castor et al. (2004) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Dietrich (1990) |
| Cannon (1975) |
Uzbekistan | |
| Uklonskiy et al. (1964) +1 other reference |
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Calama, El Loa Province, Antofagasta, Chile