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Bakakinite
A valid IMA mineral species
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About Bakakinite
Formula:
Ca2V2O7
Colour:
colourless or pale yellow
Lustre:
Vitreous
Specific Gravity:
3.463 (Calculated)
Crystal System:
Triclinic
Name:
Named for outstanding Russian crystallographer and crystal chemist Vladimir Vasilievich Bakakin (born 1933).
Known synthetic analogue. Chemically similar to cavoite; also compare UM1960-09-VO:Ca.
A chemical (stoichiometrical) but not true (structural & chemical) analogue of chervetite, blossite and ziesite.
A chemical (stoichiometrical) but not true (structural & chemical) analogue of chervetite, blossite and ziesite.
Unique Identifiers
Mindat ID:
470395
Long-form identifier:
mindat:1:1:470395:8
IMA Classification of Bakakinite
Approved
IMA Formula:
Ca2V5+2O7
Approval year:
2022
Type description reference:
Pekov, Igor V., Agakhanov, Atali A., Koshlyakova, Natalia N., Zubkova, Natalia V., Yapaskurt, Vasiliy O., Britvin, Sergey N., Vigasina, Marina F., Turchkova, Anna G., Nazarova, Maria A. (2023) Bakakinite, Ca2V2O7, a new mineral from fumarolic exhalations of the Tolbachik volcano, Kamchatka, Russia. Mineralogical Magazine, 87 (5) 695-701 doi:10.1180/mgm.2023.42
Classification of Bakakinite
8.FA.
8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
A : Polyphosphates, etc., without OH and H2O; dimers of corner-sharing RO4 tetrahedra.
8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
A : Polyphosphates, etc., without OH and H2O; dimers of corner-sharing RO4 tetrahedra.
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 |
|---|---|---|
| Bkkn | 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 Bakakinite
Vitreous
Transparency:
Transparent
Colour:
Colourless or pale yellow
Streak:
White
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
none
Fracture:
Irregular/Uneven
Density:
3.463 g/cm3 (Calculated)
Optical Data of Bakakinite
Anisotropism:
very weak
Bireflectance:
weak
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 470nm | 15.3% | 14.4% |
| 546nm | 14.3% | 12.8% |
| 589nm | 14.8% | 13.6% |
| 650nm | 14.9% | 13.9% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 15.3%.
R1 shown in black, R2 shown in red
Colour in reflected light:
grey
Pleochroism:
Not Visible
Comments:
The new mineral is transparent and optically anisotropic, however, its optical studies were carried out in reflected light due to high refractive indices. The mean refractive index calculated based on the Gladstone-Dale equation is 1.93.
Chemistry of Bakakinite
Mindat Formula:
Ca2V2O7
Element Weights:
Elements listed:
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| CaO | 37.04 % |
| SrO | 0.26 % |
| SiO2 | 0.16 % |
| P2O5 | 1.48 % |
| V2O5 | 49.47 % |
| As2O5 | 10.85 % |
| SO3 | 0.35 % |
| Total: | 99.61 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | (Ca1.99Sr0.01)?2.00(V1.64As0.28P0.06Si0.01S0.01)?2.00O7 |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia | by EPMA (WDS); empirical formula basis: 7 O apfu |
Crystallography of Bakakinite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.6241(4) Å, b = 6.9231(5) Å, c = 7.0050(4) Å
α = 86.885(7)°, β = 63.696(6)°, γ = 83.300(7)°
α = 86.885(7)°, β = 63.696(6)°, γ = 83.300(7)°
Ratio:
a:b:c = 0.957 : 1 : 1.012
Unit Cell V:
286.01 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.643 Å | (34) |
| 3.261 Å | (18) |
| 3.135 Å | (84) |
| 3.106 Å | (100) |
| 3.024 Å | (25) |
| 2.959 Å | (77) |
| 1.793 Å | (19) |
| 1.683 Å | (23) |
Reference:
Pekov, Igor V., Agakhanov, Atali A., Koshlyakova, Natalia N., Zubkova, Natalia V., Yapaskurt, Vasiliy O., Britvin, Sergey N., Vigasina, Marina F., Turchkova, Anna G., Nazarova, Maria A. (2023) Bakakinite, Ca2V2O7, a new mineral from fumarolic exhalations of the Tolbachik volcano, Kamchatka, Russia. Mineralogical Magazine, 87 (5) 695-701 doi:10.1180/mgm.2023.42
Comments:
From Type Description.
Type Occurrence of Bakakinite
General Appearance of Type Material:
flattened crystals up to 30 × 5 μm, typically distorted.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5872/1
Geological Setting of Type Material:
high-temperature (not lower than 500ºC) exhalations
Associated Minerals at Type Locality:
Reference:
Pekov, Igor V., Agakhanov, Atali A., Koshlyakova, Natalia N., Zubkova, Natalia V., Yapaskurt, Vasiliy O., Britvin, Sergey N., Vigasina, Marina F., Turchkova, Anna G., Nazarova, Maria A. (2023) Bakakinite, Ca2V2O7, a new mineral from fumarolic exhalations of the Tolbachik volcano, Kamchatka, Russia. Mineralogical Magazine, 87 (5) 695-701 doi:10.1180/mgm.2023.42
Synonyms of Bakakinite
Other Language Names for Bakakinite
Dutch:Bakakiniet
German:Bakakinit
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 8.FA. | Phosphocyclite-(Fe) | Fe2+2(P4O12) |
| 8.FA. | Phosphocyclite-(Ni) | Ni2(P4O12) |
| 8.FA. | Grahampearsonite | Ca2P2O7 |
| 8.FA. | Lisanite | CaNiP2O7 |
| 8.FA. | Shasuite | CaNi3(P2O7)2 |
| 8.FA. | Nabateaite | Fe2P2O7 |
| 8.FA. | Samraite | Ni2P2O7 |
| 8.FA. | Anastasenkoite | CaFe2+(P2O7) |
| 8.FA.05 | Blossite | α-Cu2(V2O7) |
| 8.FA.10 | Ziesite | β-Cu2(V2O7) |
| 8.FA.15 | 'UM1999-17:O:PbV' | Pb4V2O9 or Pb4(VO4)2O |
| 8.FA.15 | Chervetite | Pb2(V2O7) |
| 8.FA.20 | Yamhamelachite | KCrP2O7 |
| 8.FA.20 | 'Pyrocoproite' | (K,Na)2Mg(P2O7) |
| 8.FA.20 | 'Pyrophosphite' | K2Ca(P2O7) |
| 8.FA.25 | Petewilliamsite | (Ni,Co)30(As2O7)15 |
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 Bakakinite
mindat.org URL:
https://www.mindat.org/min-470395.html
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References for Bakakinite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2022) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 69. European Journal of Mineralogy, 34 (5) 463-468 doi:10.5194/ejm-34-463-2022
Pekov, Igor V., Agakhanov, Atali A., Koshlyakova, Natalia N., Zubkova, Natalia V., Yapaskurt, Vasiliy O., Britvin, Sergey N., Vigasina, Marina F., Turchkova, Anna G., Nazarova, Maria A. (2023) Bakakinite, Ca2V2O7, a new mineral from fumarolic exhalations of the Tolbachik volcano, Kamchatka, Russia. Mineralogical Magazine, 87 (5) 695-701 doi:10.1180/mgm.2023.42
Localities for Bakakinite
Showing 1 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.
Russia (TL) | |
| Miyawaki et al. (2022) |
Quick NavTopAbout BakakiniteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Chemical AnalysisCrystallography X-Ray Powder DiffractionType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia