Karpenkoite
A valid IMA mineral species
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About Karpenkoite
Formula:
Co3(V2O7)(OH)2 · 2H2O
Colour:
Orange
Lustre:
Vitreous
Specific Gravity:
3.415 (Calculated)
Crystal System:
Trigonal
Member of:
Name:
Named in honor of the Russian mineralogist Vladimir Yu. Karpenko (b. 1965), an expert in the mineralogy of vanadium.
The Co analogue of martyite. At the type locality karpenkoite occurs as a secondary mineral formed during the post-mining oxidation of corvusite and montroseite in a moist environment at ambient temperatures.
Unique Identifiers
Mindat ID:
46564
Long-form identifier:
mindat:1:1:46564:7
IMA Classification of Karpenkoite
Approved
IMA Formula:
Co2+3(V5+2O7)(OH)2·2H2O
Approval year:
2015
First published:
2015
Type description reference:
Classification of Karpenkoite
8.FD.05
8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
D : Polyphosphates, etc., with OH and H2O
8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
D : Polyphosphates, etc., with OH and H2O
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 |
|---|---|---|
| Kpk | 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 Karpenkoite
Vitreous
Transparency:
Transparent
Colour:
Orange
Streak:
Pale yellow-orange
Comment:
Could not be measured, probably ~3 by analogy with martyite
Tenacity:
Brittle
Cleavage:
Perfect
on {001}.
on {001}.
Parting:
with laminated fracture
Density:
3.415 g/cm3 (Calculated)
Optical Data of Karpenkoite
Type:
Uniaxial (+)
RI values:
nω = 1.827(8) nε = 1.843(8)
Max. Birefringence:
δ = 0.016
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
Pleochroism:
Non-pleochroic
Chemistry of Karpenkoite
Mindat Formula:
Co3(V2O7)(OH)2 · 2H2O
Element Weights:
Elements listed:
Crystallography of Karpenkoite
Crystal System:
Trigonal
Class (H-M):
3m(32/m) - Hexagonal Scalenohedral
Space Group:
P3m1
Setting:
P3m1
Cell Parameters:
a = 6.016(4) Å, c = 7.234(6) Å
Ratio:
a:c = 1 : 1.202
Unit Cell V:
226.7 ų
Z:
1
Morphology:
Lamellar crystals, coarsely hexagonal or irregular in shape, typically curved. The crystals form rose-like clusters or globular aggregates up to 0.2 mm across.
Comment:
The most probable space group is P¯3m1 (by analogy with its Zn analogue martyite)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.15 Å | (100) |
| 5.19 Å | (18) |
| 4.20 Å | (25) |
| 3.59 Å | (21) |
| 2.95 Å | (54) |
| 2.77 Å | (21) |
| 2.60 Å | (36) |
| 2.44 Å | (33) |
Reference:
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] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Karpenkoite
General Appearance of Type Material:
on sandstone matrix
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4605/1
Geological Setting of Type Material:
Sandstone
Associated Minerals at Type Locality:
Synonyms of Karpenkoite
Other Language Names for Karpenkoite
Dutch:Karpenkoiet
German:Karpenkoit
Relationship of Karpenkoite to other Species
Member of:
Other Members of Volborthite Group:
| Martyite | Zn3(V2O7)(OH)2 · 2H2O | Trig. 3m : P3m1 |
| Volborthite | Cu3(V2O7)(OH)2 · 2H2O | Mon. 2/m : B2/m |
Common Associates
Associations Based on Photo Data:
| 2 photos of Karpenkoite associated with Cobaltomenite | CoSeO3 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 8.FD.05 | Volborthite | Cu3(V2O7)(OH)2 · 2H2O |
| 8.FD.05 | Martyite | Zn3(V2O7)(OH)2 · 2H2O |
| 8.FD.10 | Vanarsite | NaCa12(As3+V5+8.5V4+3.5As5+6O51)2 · 78H2O |
| 8.FD.10 | Packratite | Ca11(As3+V5+10V4+2As5+6O51)2 · 83H2O |
| 8.FD.10 | Bicapite | [KNa2Mg2(H2O)25][H2PV5+12O40(V5+O)2] |
| 8.FD.10 | Morrisonite | Ca11(As3+V4+2V5+10As5+6O51)2 · 78H2O |
| 8.FD.10 | Lumsdenite | NaCa3Mg2(As3+V4+2V5+10As5+6O51) · 45H2O |
| 8.FD.10 | Gatewayite | Ca6(As3+V4+3 V5+9As5+6O51) · 31H2O |
| 8.FD.10 | Kegginite | Pb3Ca3[AsV12O40(VO)] · 20H2O |
| 8.FD.15 | Chinchorroite | Na2Mg5(As2O7)2(AsO3OH)2(H2O)10 |
Fluorescence of Karpenkoite
none
Other Information
Notes:
Karpenkoite is insoluble in H2O but easily soluble in cold diluted HCl or HNO3.
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 Karpenkoite
mindat.org URL:
https://www.mindat.org/min-46564.html
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Please feel free to link to this page.
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References for Karpenkoite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter No 24. Mineralogical Magazine, 79 (2) 247-251 doi:10.1180/minmag.2015.079.2.03
Localities for Karpenkoite
Showing 2 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.
USA (TL) | |
| Hålenius et al. (2015) +3 other references |
| Collection of Chuck Adan |
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Little Eva Mine, Yellow Cat Mesa, Thompsons Mining District, Grand County, Utah, USA