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Magnesioaubertite
A valid IMA mineral species
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About Magnesioaubertite
Formula:
(Mg,Cu)Al(SO4)2Cl · 14H2O
Colour:
Sky blue
Lustre:
Vitreous
Hardness:
2 - 3
Specific Gravity:
1.80
Crystal System:
Triclinic
Member of:
Name:
For being the Mg analogue of aubertite.
Unique Identifiers
Mindat ID:
2521
Long-form identifier:
mindat:1:1:2521:4
IMA Classification of Magnesioaubertite
Approved
IMA Formula:
MgAl(S6+O4)2Cl·14H2O
Approval year:
1982
First published:
1988
Classification of Magnesioaubertite
7.DB.05
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
B : With only medium-sized cations; insular octahedra and finite units
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
B : With only medium-sized cations; insular octahedra and finite units
31.9.8.3
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
26.10
26 : Sulphates with Halide
26 : Sulphates with Halide
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 for Standard |
|---|---|---|
| Maub | 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 Magnesioaubertite
Vitreous
Transparency:
Transparent
Colour:
Sky blue
Streak:
White
Hardness:
2 - 3 on Mohs scale
Cleavage:
Distinct/Good
{010}
{010}
Density:
1.80(3) g/cm3 (Measured) 1.78 g/cm3 (Calculated)
Optical Data of Magnesioaubertite
Type:
Biaxial (-)
RI values:
nα = 1.466(1) nβ = 1.481(1) nγ = 1.4875(1)
2V:
Measured: 112° to 114°, Calculated: 66°
Max. Birefringence:
δ = 0.022
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate (negative)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
relatively weak : r > v
Optical Extinction:
X ∧ (010) = 17(1)°.
Pleochroism:
Visible
Comments:
X = colorless; Y = Z = pale blue.
Chemistry of Magnesioaubertite
Mindat Formula:
(Mg,Cu)Al(SO4)2Cl · 14H2O
Element Weights:
Crystallography of Magnesioaubertite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.31 Å, b = 13.20(2) Å, c = 6.29(1) Å
α = 91.74°, β = 94.55°, γ = 82.62°
α = 91.74°, β = 94.55°, γ = 82.62°
Ratio:
a:b:c = 0.478 : 1 : 0.477
Unit Cell V:
517.82 ų (Calculated from Unit Cell)
Z:
1
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.26 Å | (50) |
| 5.61 Å | (70) |
| 4.81 Å | (50) |
| 4.50 Å | (100) |
| 4.25 Å | (60) |
| 3.97 Å | (80) |
| 3.68 Å | (60) |
| 3.12 Å | (50) |
| 2.696 Å | (50) |
Comments:
Vulcano, Italy. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45a : [Sulfates, arsenates, selenates, antimonates] | |
| 45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Magnesioaubertite
General Appearance of Type Material:
Polycrystalline aggregates, always enclosed by pickeringite, on a base of alunogen. The aggregates are up to 2 cm and consist of xenomorphic granular single crystals several hundred micrometers in diameter.
Place of Conservation of Type Material:
University of Bochum, Bochum, Germany; National Museum of Natural History, Washington, D.C., USA, 168433.
Geological Setting of Type Material:
Fumarolic gasses on rocks containing aluminium.
Associated Minerals at Type Locality:
Synonyms of Magnesioaubertite
Other Language Names for Magnesioaubertite
Relationship of Magnesioaubertite to other Species
Member of:
Other Members of Aubertite Group:
| Aubertite | CuAl(SO4)2Cl · 14H2O | Tric. 1 : P1 |
| Svyazhinite | (Mg,Mn2+,Ca)(Al,Fe3+)(SO4)2F · 14H2O | Tric. |
| Wilcoxite | MgAl(SO4)2F · 17H2O | Tric. 1 : P1 |
Common Associates
Associations Based on Photo Data:
| 10 photos of Magnesioaubertite associated with Pickeringite | MgAl2(SO4)4 · 22H2O |
| 1 photo of Magnesioaubertite associated with Amarillite | NaFe(SO4)2 · 6H2O |
| 1 photo of Magnesioaubertite associated with Halotrichite | Fe2+Al2(SO4)4 · 22H2O |
| 1 photo of Magnesioaubertite associated with Blödite | Na2Mg(SO4)2 · 4H2O |
Related Minerals - Strunz-mindat Grouping
| 7.DB.05 | Svyazhinite | (Mg,Mn2+,Ca)(Al,Fe3+)(SO4)2F · 14H2O |
| 7.DB.05 | Aubertite | CuAl(SO4)2Cl · 14H2O |
| 7.DB.10 | Rostite | Al(SO4)(OH) · 5H2O |
| 7.DB.10 | Khademite | Al(SO4)F · 5H2O |
| 7.DB.15 | Jurbanite | Al(SO4)(OH) · 5H2O |
| 7.DB.20 | Minasragrite | (V4+O)(SO4) · 5H2O |
| 7.DB.20 | Anorthominasragrite | (V4+O)(SO4) · 5H2O |
| 7.DB.20 | Orthominasragrite | (V4+O)(SO4) · 5H2O |
| 7.DB.25 | Bobjonesite | (V4+O)(SO4) · 3H2O |
| 7.DB.27 | Karpovite | Tl2VO(SO4)2(H2O) |
| 7.DB.30 | Metahohmannite | Fe3+2(SO4)2O · 4H2O |
| 7.DB.30 | Hohmannite | Fe3+2(SO4)2O · 8H2O |
| 7.DB.30 | Amarantite | Fe3+2(SO4)2O · 7H2O |
| 7.DB.35 | Calciocopiapite | CaFe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Zincocopiapite | ZnFe3+4(SO4)6(OH)2 · 18H2O |
| 7.DB.35 | Aluminocopiapite | Al2/3Fe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Copiapite | Fe2+Fe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Cuprocopiapite | Cu2+Fe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Magnesiocopiapite | MgFe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Ferricopiapite | Fe3+0.67Fe3+4(SO4)6(OH)2 · 20H2O |
Other Information
Notes:
Soluble in H2O
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 Magnesioaubertite
mindat.org URL:
https://www.mindat.org/min-2521.html
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Please feel free to link to this page.
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References for Magnesioaubertite
Localities for Magnesioaubertite
Showing 7 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Chile | |
| XRD by Joachim Lorenz |
| Samples analysed by Dr. Jochen Schlüter (Hamburg University) +1 other reference |
| Pueyo et al. (2021) |
Greece | |
| Rieck et al. (2022) |
| Rieck et al. (2022) |
Italy | |
| GEBHARD G. et al. (1988) |
| GEBHARD G. et al. (1988) |
Quick NavTopAbout MagnesioaubertiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Faraglione Ranni, Faraglioni di Levante, Porto Levante, Vulcano Island, Lipari, Eolie Islands, Metropolitan City of Messina, Sicily, Italy