Kobyashevite
A valid IMA mineral species
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About Kobyashevite
Formula:
Cu5(SO4)2(OH)6 · 4H2O
Formula may be written CuCu4(SO4)2(OH)6·4H2O, to better show relation to devilline.
Colour:
Bluish-green to turquoise-coloured
Lustre:
Vitreous
Hardness:
2½
Specific Gravity:
3.16 (Calculated)
Crystal System:
Triclinic
Member of:
Name:
Named in honor of Yurii Stepanovich Kobyashev (Юрий Степанович Кобяшев) (1935-2009) Russian mineralogist and famous collector of minerals, researcher at the Natural Science Museum of the Ilmen (Ilmensky) Reserve from 1988 to 2007, in recognition of his contribution to the study of the mineralogy of the Urals.
Known also as an anthropogenic/synthetic phase found on altered copper and bronze pieces ("strandbergite").
Decomposes in water within 10 min (Yoder et al., 2007).
It is very easy to grow specimens artificially using copper sulphate solution to attack existing calcite crystals. Specimens sold from Ojuela mine, Mexico in recent years are highly likely to be manufactured in such a way. See https://www.mindat.org/mesg-537446.html
Decomposes in water within 10 min (Yoder et al., 2007).
Fakes
It is very easy to grow specimens artificially using copper sulphate solution to attack existing calcite crystals. Specimens sold from Ojuela mine, Mexico in recent years are highly likely to be manufactured in such a way. See https://www.mindat.org/mesg-537446.html
Artificial kobyashevite and gypsum replacing calcite
Unique Identifiers
Mindat ID:
42367
Long-form identifier:
mindat:1:1:42367:8
IMA Classification of Kobyashevite
Approved
IMA Formula:
Cu2+5(S6+O4)2(OH)6·4H2O
Approval year:
2011
First published:
2013
Type description reference:
Pekov, Igor V., Zubkova, Natalia V., Yapaskurt, Vasiliy O., Belakovskiy, Dmitriy I., Chukanov, Nikita V., Kasatkin, Anatoly V., Kuznetsov, Aleksey M., Pushcharovsky, Dmitry Y. (2013) Kobyashevite, Cu5(SO4)2(OH)6·4H2O, a new devilline-group mineral from the Vishnevye Mountains, South Urals, Russia. Mineralogy and Petrology, 107 (2) 201-210 doi:10.1007/s00710-012-0236-4
Classification of Kobyashevite
7.DD.15
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
D : With only medium-sized cations; sheets of edge-sharing octahedra
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
D : With only medium-sized cations; sheets of edge-sharing octahedra
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 |
|---|---|---|
| Kby | 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 Kobyashevite
Vitreous
Transparency:
Transparent
Colour:
Bluish-green to turquoise-coloured
Streak:
Pale bluish green
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
{010}
{010}
Fracture:
Step-Like
Density:
3.16 g/cm3 (Calculated)
Comment:
Could not be measured
Optical Data of Kobyashevite
Type:
Biaxial (-)
RI values:
nα = 1.602(4) nβ = 1.666(5) nγ = 1.679(5)
2V:
Measured: 50° (10), Calculated: 47°
Max. Birefringence:
δ = 0.077
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
Dispersion:
Strong, r < v
Optical Extinction:
Z is close to the crystal elongation direction
Pleochroism:
Visible
Comments:
Medium, Z > Y > X; the mineral is bluish-green in all sections but the intensity depends on orientation.
Chemistry of Kobyashevite
Mindat Formula:
Cu5(SO4)2(OH)6 · 4H2O
Formula may be written CuCu4(SO4)2(OH)6·4H2O, to better show relation to devilline.
Formula may be written CuCu4(SO4)2(OH)6·4H2O, to better show relation to devilline.
Element Weights:
Elements listed:
Crystallography of Kobyashevite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.0731(6) Å, b = 11.0597(13) Å, c = 5.5094(6) Å
α = 102.883(9)°, β = 92.348(8)°, γ = 92.597(9)°
α = 102.883(9)°, β = 92.348(8)°, γ = 92.597(9)°
Ratio:
a:b:c = 0.549 : 1 : 0.498
Unit Cell V:
359.87 ų
Z:
1
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0018667 | Kobyashevite | Strandberg H, Langer V, Johansson L G (1995) Structure of Cu2.5(OH)3SO4*2H2O: a novel corrosion product of copper Acta Chemica Scandinavica 49 5-10 | 1995 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.84 Å | (100) |
| 5.399 Å | (40) |
| 5.178 Å | (12) |
| 3.590 Å | (16) |
| 2.691 Å | (16) |
| 2.653 Å | (12) |
| 2.583 Å | (12) |
| 2.425 Å | (12) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45b : [Other oxidized fumarolic minerals] | |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Kobyashevite
General Appearance of Type Material:
Elongated crystals up to 0.2 mm typically curved or split and combined into thin crusts up to 1 × 2 mm.
Place of Conservation of Type Material:
The type specimen is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4152/1.
Geological Setting of Type Material:
In cavities of a calcite-quartz vein.
Associated Minerals at Type Locality:
Reference:
Pekov, Igor V., Zubkova, Natalia V., Yapaskurt, Vasiliy O., Belakovskiy, Dmitriy I., Chukanov, Nikita V., Kasatkin, Anatoly V., Kuznetsov, Aleksey M., Pushcharovsky, Dmitry Y. (2013) Kobyashevite, Cu5(SO4)2(OH)6·4H2O, a new devilline-group mineral from the Vishnevye Mountains, South Urals, Russia. Mineralogy and Petrology, 107 (2) 201-210 doi:10.1007/s00710-012-0236-4
Synonyms of Kobyashevite
Other Language Names for Kobyashevite
Dutch:Kobyasheviet
German:Kobyashevit
Relationship of Kobyashevite to other Species
Member of:
Other Members of Devilline Group:
| Aldridgeite | (Cd2+,Ca)(Cu2+,Zn2+)4(S6+O4)2(OH)6 · 3H2O | Mon. 2/m : B2/b |
| Campigliaite | Mn2+Cu4(SO4)2(OH)6 · 4H2O | Mon. 2 : B2 |
| Devilline | CaCu4(SO4)2(OH)6 · 3H2O | Mon. 2/m : P21/b |
| Lautenthalite | PbCu4(SO4)2(OH)6 · 3H2O | Mon. 2/m : P21/b |
| Orthoserpierite | Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O | Orth. mm2 : Pca21 |
| Serpierite | Ca(Cu2+,Zn2+)4(S6+O4)2(OH)6 · 3H2O | Mon. 2/m : B2/b |
| 'Unnamed (Dimorph of Devilline)' | CaCu4(SO4)2(OH)6 · 3H2O | Mon. 2/m : P21/b |
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 7.DD. | Asagiite | NiCu4(SO4)2(OH)6 · 6H2O |
| 7.DD.05 | Felsőbányaite | Al4(SO4)(OH)10 · 4H2O |
| 7.DD.07 | Llantenesite | Cu6Al[SeO4](OH)12Cl · 3H2O |
| 7.DD.10 | Langite | Cu4(SO4)(OH)6 · 2H2O |
| 7.DD.10 | Fehrite | MgCu4(SO4)2(OH)6 · 6H2O |
| 7.DD.10 | Posnjakite | Cu4(SO4)(OH)6 · H2O |
| 7.DD.10 | Wroewolfeite | Cu4(SO4)(OH)6 · 2H2O |
| 7.DD.10 | Gobelinite | CoCu4(SO4)2(OH)6 · 6H2O |
| 7.DD.15 | Spangolite | Cu6Al(SO4)(OH)12Cl · 3H2O |
| 7.DD.15 | 'Unnamed (Dimorph of Devilline)' | CaCu4(SO4)2(OH)6 · 3H2O |
| 7.DD.20 | Ktenasite | ZnCu4(SO4)2(OH)6 · 6H2O |
| 7.DD.25 | Christelite | Cu2Zn3(SO4)2(OH)6 · 4H2O |
| 7.DD.30 | Edwardsite | Cu3Cd2(SO4)2(OH)6 · 4H2O |
| 7.DD.30 | Niedermayrite | CdCu4(SO4)2(OH)6 · 4H2O |
| 7.DD.30 | Serpierite | Ca(Cu2+,Zn2+)4(S6+O4)2(OH)6 · 3H2O |
| 7.DD.30 | Campigliaite | Mn2+Cu4(SO4)2(OH)6 · 4H2O |
| 7.DD.30 | Orthoserpierite | Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O |
| 7.DD.30 | Devilline | CaCu4(SO4)2(OH)6 · 3H2O |
| 7.DD.35 | Shigaite | Mn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O |
| 7.DD.35 | Zincaluminite | (Zn1-xAlx)(SO4)x/2(OH)2 · nH2O |
| 7.DD.35 | Zincowoodwardite | Zn1-xAlx(OH)2[SO4]x/2 · nH2O |
| 7.DD.35 | Natroglaucocerinite | Zn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O |
| 7.DD.35 | Hydrowoodwardite | (Cu1-xAlx)(OH)2[SO4]x/2 · nH2O |
| 7.DD.35 | Honessite | (Ni1-xFe3+x)(OH)2[SO4]x/2 · nH2O |
| 7.DD.35 | Carrboydite | (Ni1-xAlx)(SO4)x/2(OH)2 · nH2O |
| 7.DD.35 | Glaucocerinite | (Zn1-xAlx)(OH)2(SO4)x/2 · nH2O |
| 7.DD.35 | Wermlandite | Mg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2O |
| 7.DD.35 | Nikischerite | Fe2+6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O |
| 7.DD.35 | Hydrohonessite | (Ni1-xFe3+x)(OH)2(SO4)x/2 · nH2O |
| 7.DD.35 | Woodwardite | Cu1-xAlx(OH)2(SO4)x/2 · nH2O |
| 7.DD.35 | Motukoreaite | Mg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O |
| 7.DD.35 | Mountkeithite | [(Mg1-xFe3+x)(OH)2][SO4]x/2 · nH2O |
| 7.DD.40 | Lawsonbauerite | (Mn2+,Mg)9Zn4(SO4)2(OH)22 · 8H2O |
| 7.DD.40 | Torreyite | (Mg,Mn2+)7◻2Mn2+2Zn4(SO4)2(OH)22 · 8H2O |
| 7.DD.40 | Isselite | Cu6(SO4)(OH)10(H2O)4 · H2O |
| 7.DD.45 | Mooreite | Mg9◻2Mn2Zn4(SO4)2(OH)26 · 8H2O |
| 7.DD.45 | Hodgesmithite | (Cu,Zn)6Zn(SO4)2(OH)10 · 3H2O |
| 7.DD.47 | Lahnsteinite | Zn4(SO4)(OH)6 · 3H2O |
| 7.DD.50 | Namuwite | Zn4(SO4)(OH)6 · 4H2O |
| 7.DD.50 | Minohlite | (Cu,Zn)7(SO4)2(OH)10 · 8H2O |
| 7.DD.52 | Lauraniite | Cu6Cd2(SO4)2(OH)12 · 5H2O |
| 7.DD.55 | Bechererite | Zn7Cu(OH)13[(SiO(OH)3(SO4)] |
| 7.DD.60 | Ramsbeckite | (Cu,Zn)15(SO4)4(OH)22 · 6H2O |
| 7.DD.65 | Vonbezingite | Ca6Cu3(SO4)3(OH)12 · 2H2O |
| 7.DD.70 | Redgillite | Cu6(SO4)(OH)10 · H2O |
| 7.DD.75 | Nickelalumite | NiAl4(SO4)(OH)12(H2O)3 |
| 7.DD.75 | Kyrgyzstanite | ZnAl4(SO4)(OH)12 · 3H2O |
| 7.DD.75 | Chalcoalumite | CuAl4(SO4)(OH)12 · 3H2O |
| 7.DD.80 | Schulenbergite | (Cu,Zn)7(SO4)2(OH)10 · 3H2O |
| 7.DD.80 | 'UM1992-30-SO:CCuHZn' | (Zn,Cu)7(SO4,CO3)2(OH)10 · 3H2O |
| 7.DD.80 | Thérèsemagnanite | NaCo4(SO4)(OH)6Cl · 6H2O |
| 7.DD.80 | Guarinoite | Zn6(SO4)(OH)10 · 5H2O |
| 7.DD.85 | Montetrisaite | Cu6(SO4)(OH)10 · 2H2O |
Fluorescence of Kobyashevite
Not fluorescent
Other Information
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 Kobyashevite
mindat.org URL:
https://www.mindat.org/min-42367.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Kobyashevite
Reference List:
Strandberg, Helena, Langer, Vratislav, Johansson, Lars-Gunnar, Bálint, József, Fogassy, Elemér, Christensen, Lene Krogh, Napoli, Anna, Sindona, Giovanni, Aksnes, Dagfinn W., Francis, George W., Aaberg, Atle (1995) Structure of Cu2.5(OH)3SO4.2H2O: a Novel Corrosion Product of Copper. Acta Chemica Scandinavica, 49. 5-10 doi:10.3891/acta.chem.scand.49-0005
Krätschmer, A., Odnevall Wallinder, I., Leygraf, C. (2002) The evolution of outdoor copper patina. Corrosion Science, 44. 425-450 doi:10.1016/s0010-938x(01)00081-6
Yoder, C. H., Agee, T. M., Ginion, K. E., Hofmann, A. E., Ewanichak, J. E., Schaeffer, C. D., Carroll, M. J., Schaeffer, R. W., McCaffrey, P. F. (2007) The relative stabilities of the copper hydroxyl sulphates. Mineralogical Magazine, 71 (5) 571-577 doi:10.1180/minmag.2007.071.5.571
Yoder, C. H., Gotlieb, N. R., Rowand, A. L. (2010) The relative stability of stoichiometrically related natural and synthetic double salts. American Mineralogist, 95 (1) 47-51 doi:10.2138/am.2010.3244
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011. CNMNC Newsletter No 11. Mineralogical Magazine, 75 (6) 2887-2893 doi:10.1180/minmag.2011.075.6.2887
Pekov, Igor V., Zubkova, Natalia V., Yapaskurt, Vasiliy O., Belakovskiy, Dmitriy I., Chukanov, Nikita V., Kasatkin, Anatoly V., Kuznetsov, Aleksey M., Pushcharovsky, Dmitry Y. (2013) Kobyashevite, Cu5(SO4)2(OH)6·4H2O, a new devilline-group mineral from the Vishnevye Mountains, South Urals, Russia. Mineralogy and Petrology, 107 (2) 201-210 doi:10.1007/s00710-012-0236-4
Localities for Kobyashevite
Showing 4 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.
Mexico | |
| RRUFF database. Eugene Schlepp specimen. |
Russia (TL) | |
| Williams et al. (2011) +1 other reference |
USA | |
| Kampf et al. (2016) +1 other reference |
| Carnegie Museum of Natural History ... |
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San Miguel County, Colorado, USA