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Kobyashevite

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About KobyasheviteHide

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:
Specific Gravity:
3.16 (Calculated)
Crystal System:
Triclinic
Member of:
Name:
For Yurii Stepanovich Kobyashev (1935-2009) Russian mineralogist, scientific worker of Ilmeny Natural Reserve.
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).


Classification of KobyasheviteHide

Approved
Approval Year:
2011

Physical Properties of KobyasheviteHide

Vitreous
Colour:
Bluish-green to turquoise-coloured
Hardness:
2½ on Mohs scale
Cleavage:
Distinct/Good
{010}
Density:
3.16 g/cm3 (Calculated)

Optical Data of KobyasheviteHide

Type:
Biaxial (-)
RI values:
nα = 1.602(4) nβ = 1.666(5) nγ = 1.679(5)
2V:
Measured: 50°
Max Birefringence:
δ = 0.077
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of KobyasheviteHide

Formula:
Cu5(SO4)2(OH)6·4H2O

Formula may be written CuCu4(SO4)2(OH)6·4H2O, to better show relation to devilline.
IMA Formula:
Cu5(SO4)2(OH)6 · 4H2O

Crystallography of KobyasheviteHide

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)°
Ratio:
a:b:c = 0.549 : 1 : 0.498
Unit Cell V:
359.87 ų
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.84 (100)
5.399 (40)
5.178 (12)
3.590 (16)
2.691 (16)
2.653 (12)
2.583 (12)
2.425 (12)

Type Occurrence of KobyasheviteHide

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:

Synonyms of KobyasheviteHide

Relationship of Kobyashevite to other SpeciesHide

Member of:
Other Members of this group:
Aldridgeite(Cd,Ca)(Cu,Zn)4(SO4)2(OH)6 · 3H2O Mon. 2/m : B2/b
CampigliaiteMn2+Cu4(SO4)2(OH)6 · 4H2OMon.
DevillineCaCu4(SO4)2(OH)6 · 3H2OMon. 2/m : P21/b
LautenthalitePbCu4(SO4)2(OH)6 · 3H2OMon. 2/m : P21/b
Unnamed (Dimorph of Devilline)CaCu4(SO4)2(OH)6 · 3H2OMon. 2/m : P21/b

Common AssociatesHide

Associated Minerals Based on Photo Data:
Calcite1 photo of Kobyashevite associated with Calcite on mindat.org.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for KobyasheviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
I. Strandberg, H., Langer, V. and Johansson, L.-G. (1995): Structure of Cu2.5(OH)3SO4•2H2O; a novel corrosion product of copper. Acta Chem. Scand. 49, 5-10.
Krätschmer, A.; Odnevall Wallinder, I.; Leygraf, C. (2002): The evolution of outdoor copper patina. Corrosion Science, 44, 425-450. [as "strandbergite"]
Yoder, C. H., Agee, T. M., Ginion, K. E., Hofmann, A. E., Ewanichak, J. E., Schaeffer, C. D., Jr., Carroll, M. J., Schaeffer, R. W. & McCaffrey, P. F. (2007): The relative stabilities of the copper hydroxyl sulphates. Mineralogical Magazine 71, 571-577.
Yoder, Claude H.; Gotlieb, Naomi R.; Rowand, Anne L. (2010): The relative stability of stoichiometrically related natural and synthetic double salts. American Mineralogist 95, 47-51.
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Chukanov, N.V., Kasatkin, A.V., Kuznetsov, A.M. and Pushcharovsky, D.Y. (2011): Kobyashevite, IMA 2011-066. CNMNC Newsletter No. 11, December 2011, page 2890; Mineralogical Magazine, 75, 2887-2893.
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Chukanov, N.V., Kasatkin, A.V., Kuznetsov, A.M., Pushcharovsky, D.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, 201-210.

Internet Links for KobyasheviteHide

Localities for KobyasheviteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Mexico
 
  • Durango
    • Mun. de Mapimí
      • Mapimí
RRUFF database. Eugene Schlepp specimen.
Russia (TL)
 
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
        • Vishnevye Mts (Vishnyovye; Cherry)
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Chukanov, N.V., Kasatkin, A.V., Kuznetsov, A.M. and Pushcharovsky, D.Y. (2011): Kobyashevite, IMA 2011-066. CNMNC Newsletter No. 11, December 2011, page 2890; Mineralogical Magazine, 75, 2887-2893; Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Chukanov, N.V., Kasatkin, A.V., Kuznetsov, A.M., Pushcharovsky, D.Y. (2013): Kobyashevite, Cu5(SO4)2(OH)6•4H2O, a new devilline-group mineral from the Vishnevye Mountains, South Urals, Russia. Mineral. Petrol. 107, 201-210.
USA
 
  • California
    • Inyo Co.
      • Inyo Mts (Inyo Range)
        • Malpais Mesa
Kampf, A. R., Mills, S. J., & Nash, B. P. (2016). PREPUBLICATION: Pauladamsite, Cu4 (SeO3)(SO4)(OH) 4· 2H2O, a new mineral from the Santa Rosa mine, Darwin district, California, USA. Mineralogical Magazine.; Paul M. Adams (2017) The Santa Rosa mine, Inyo County, California. Minerlogical Record 48:755-777
Mineral and/or Locality  
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