Cobaltoblödite
A valid IMA mineral species
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About Cobaltoblödite
Formula:
Na2Co(SO4)2 · 4H2O
Colour:
Reddish-pink in aggregates.
Lustre:
Vitreous
Hardness:
2½
Specific Gravity:
2.29
Crystal System:
Monoclinic
Member of:
Name:
Co-dominant analogue of blödite.
This page provides mineralogical data about Cobaltoblödite.
Name Encoding
ASCII-7:
Cobaltoblodite
Unique Identifiers
Mindat ID:
43582
Long-form identifier:
mindat:1:1:43582:2
IMA Classification of Cobaltoblödite
Approved
IMA Formula:
Na2Co2+(S6+O4)2·4H2O
Approval year:
2012
First published:
2013
Type description reference:
Kasatkin, A. V., Nestola, F., Plášil, J., Marty, J., Belakovskiy, D. I., Agakhanov, A. A., Mills, S. J., Pedron, D., Lanza, A., Favaro, M., Bianchin, S., Lykova, I. S., Goliáš, V., Birch, W. D. (2013) Manganoblödite, Na2Mn(SO4)2·4H2O, and cobaltoblödite, Na2Co(SO4)2·4H2O: two new members of the blödite group from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine, 77 (3) 367-383 doi:10.1180/minmag.2013.077.3.10
Classification of Cobaltoblödite
7.CC.
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
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 |
|---|---|---|
| Cblö | 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 Cobaltoblödite
Vitreous
Transparency:
Transparent
Colour:
Reddish-pink in aggregates.
Streak:
White
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
none
Fracture:
Irregular/Uneven
Density:
2.29(2) g/cm3 (Measured) 2.347 g/cm3 (Calculated)
Optical Data of Cobaltoblödite
Type:
Biaxial (-)
RI values:
nα = 1.498(2) nβ = 1.503(2) nγ = 1.505(2)
2V:
Measured: 70° (10), Calculated: 64°
Max. Birefringence:
δ = 0.007
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:
r > v, weak.
Pleochroism:
Non-pleochroic
Chemistry of Cobaltoblödite
Mindat Formula:
Na2Co(SO4)2 · 4H2O
Element Weights:
Crystallography of Cobaltoblödite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/a
Cell Parameters:
a = 11.147(1) Å, b = 8.268(1) Å, c = 5.5396(7) Å
β = 100.517(11)°
β = 100.517(11)°
Ratio:
a:b:c = 1.348 : 1 : 0.67
Unit Cell V:
501.97 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.551 Å | (80) |
| 4.269 Å | (50) |
| 3.795 Å | (18) |
| 3.339 Å | (43) |
| 3.290 Å | (100) |
| 3.258 Å | (58) |
| 2.644 Å | (21) |
| 2.296 Å | (22) |
Reference:
Kasatkin, A. V., Nestola, F., Plášil, J., Marty, J., Belakovskiy, D. I., Agakhanov, A. A., Mills, S. J., Pedron, D., Lanza, A., Favaro, M., Bianchin, S., Lykova, I. S., Goliáš, V., Birch, W. D. (2013) Manganoblödite, Na2Mn(SO4)2·4H2O, and cobaltoblödite, Na2Co(SO4)2·4H2O: two new members of the blödite group from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine, 77 (3) 367-383 doi:10.1180/minmag.2013.077.3.10
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Cobaltoblödite
General Appearance of Type Material:
Aggregates of anhedral grains up to 200 μm forming thin crusts covering areas up to 2×2 cm on the surface of other sulfates.
Place of Conservation of Type Material:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4271/1, and Museum Victoria, Melbourne, Australia, catalogue number M52196.
Geological Setting of Type Material:
Post mining. Formed in moist adits in a sandstone-hosted uranium deposit.
Associated Minerals at Type Locality:
Reference:
Kasatkin, A. V., Nestola, F., Plášil, J., Marty, J., Belakovskiy, D. I., Agakhanov, A. A., Mills, S. J., Pedron, D., Lanza, A., Favaro, M., Bianchin, S., Lykova, I. S., Goliáš, V., Birch, W. D. (2013) Manganoblödite, Na2Mn(SO4)2·4H2O, and cobaltoblödite, Na2Co(SO4)2·4H2O: two new members of the blödite group from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine, 77 (3) 367-383 doi:10.1180/minmag.2013.077.3.10
Synonyms of Cobaltoblödite
Other Language Names for Cobaltoblödite
Dutch:Cobaltoblödiet
German:Cobaltoblödit
Relationship of Cobaltoblödite to other Species
Member of:
Other Members of Blödite Group:
| Blödite | Na2Mg(SO4)2 · 4H2O | Mon. 2/m : P21/b |
| Changoite | Na2Zn(SO4)2 · 4H2O | Mon. 2/m : P21/b |
| Manganoblödite | Na2Mn(SO4)2 · 4H2O | Mon. 2/m : P21/b |
| Nickelblödite | Na2Ni(SO4)2 · 4H2O | Mon. 2/m : P21/b |
Common Associates
Associations Based on Photo Data:
| 1 photo of Cobaltoblödite associated with Manganoblödite | Na2Mn(SO4)2 · 4H2O |
Related Minerals - Strunz-mindat Grouping
| 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 | Mendozite | NaAl(SO4)2 · 11H2O |
| 7.CC.15 | Kalinite | KAl(SO4)2 · 11H2O |
| 7.CC.20 | Alum-(Na) | NaAl(SO4)2 · 12H2O |
| 7.CC.20 | Lonecreekite | (NH4)Fe3+(SO4)2 · 12H2O |
| 7.CC.20 | Alum-(K) | KAl(SO4)2 · 12H2O |
| 7.CC.20 | Tschermigite | (NH4)Al(SO4)2 · 12H2O |
| 7.CC.20 | Lanmuchangite | Tl+Al(SO4)2 · 12H2O |
| 7.CC.25 | Zincovoltaite | K2Zn5Fe3+3Al(SO4)12 · 18H2O |
| 7.CC.25 | Voltaite | K2Fe2+5Fe3+3Al(SO4)12 · 18H2O |
| 7.CC.25 | Magnesiovoltaite | K2Mg5Fe3+3Al(SO4)12 · 18H2O |
| 7.CC.25 | Pertlikite | K2(Fe2+,Mg)2(Mg,Fe3+)4Fe3+2Al(SO4)12 · 18H2O |
| 7.CC.25 | Ammoniomagnesiovoltaite | (NH4)2Mg2+5Fe3+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 | Nickelblödite | Na2Ni(SO4)2 · 4H2O |
| 7.CC.50 | Blödite | Na2Mg(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 | Nickelpicromerite | K2Ni(SO4)2 · 6H2O |
| 7.CC.60 | Nickelboussingaultite | (NH4)2Ni(SO4)2 · 6H2O |
| 7.CC.60 | Katerinopoulosite | (NH4)2Zn(SO4)2 · 6H2O |
| 7.CC.60 | Picromerite | K2Mg(SO4)2 · 6H2O |
| 7.CC.60 | Cyanochroite | K2Cu(SO4)2 · 6H2O |
| 7.CC.60 | Mohrite | (NH4)2Fe(SO4)2 · 6H2O |
| 7.CC.60 | Boussingaultite | (NH4)2Mg(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) |
Fluorescence of Cobaltoblödite
Not fluorescent.
Other Information
Notes:
Dissolves slowly in water water.
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 Cobaltoblödite
mindat.org URL:
https://www.mindat.org/min-43582.html
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Please feel free to link to this page.
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References for Cobaltoblödite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2013) IMA Commission on New Minerals, Nomenclature and Classification. CNMNC Newsletter No. 15. Mineralogical Magazine, 77 (1) 1-12 doi:10.1180/minmag.2013.077.1.01
Kasatkin, A. V., Nestola, F., Plášil, J., Marty, J., Belakovskiy, D. I., Agakhanov, A. A., Mills, S. J., Pedron, D., Lanza, A., Favaro, M., Bianchin, S., Lykova, I. S., Goliáš, V., Birch, W. D. (2013) Manganoblödite, Na2Mn(SO4)2·4H2O, and cobaltoblödite, Na2Co(SO4)2·4H2O: two new members of the blödite group from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine, 77 (3) 367-383 doi:10.1180/minmag.2013.077.3.10
Marinova, Delyana, Wildner, Manfred, Bancheva, Tsvetelina, Stoyanova, Radostina, Georgiev, Mitko, Stoilova, Donka G. (2018) Synthesis, structure and properties of blödite-type solid solutions, Na2Co1−xCux(SO4)2·4H2O (0 < x ≤ 0.18), and crystal structure of synthetic kröhnkite, Na2Cu(SO4)2·2H2O. Physics and Chemistry of Minerals, 45 (8) 801-817 doi:10.1007/s00269-018-0963-0
Localities for Cobaltoblödite
Showing 1 localities.
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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.
USA (TL) | |
| Williams et al. (2013) +1 other reference |
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Blue Lizard Mine, Red Canyon Mining District, San Juan County, Utah, USA