Fedotovite
A valid IMA mineral species
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About Fedotovite
Sergei A. Fedotov
Formula:
K2Cu3(SO4)3O
Colour:
Emerald green to grass green
Lustre:
Vitreous, Silky
Hardness:
2½
Specific Gravity:
3.205
Crystal System:
Monoclinic
Name:
Named in honor of Sergei Aleksandrovich Fedotov (Сергей Александрович Федотов) (19 March 1931, Leningra, USSR – 20 August 2019), volcanologist and seismologist, Director of the Institute of Volcanology, Petropavlovsk-Kamchatkskii, Russia.
Unique Identifiers
Mindat ID:
1469
Long-form identifier:
mindat:1:1:1469:0
GUID
(UUID V4):
(UUID V4):
adb61431-cdf6-4921-968d-8490b1dad9d8
IMA Classification of Fedotovite
Approved
IMA Formula:
K2Cu3O(SO4)3
Approval year:
1986
First published:
1988
Classification of Fedotovite
7.BC.30
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
C : With medium-sized and large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
C : With medium-sized and large cations
30.3.4.1
30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)5(XO4)3Zq
30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)5(XO4)3Zq
25.2.14
25 : Sulphates
2 : Sulphates of Cu and Ag
25 : Sulphates
2 : Sulphates of Cu and Ag
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 |
|---|---|---|
| Fdt | 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 Fedotovite
Vitreous, Silky
Transparency:
Transparent
Colour:
Emerald green to grass green
Streak:
Pale grass green
Hardness:
2½ on Mohs scale
Cleavage:
Perfect
on {100}
on {100}
Density:
3.205(3) g/cm3 (Measured) 3.09 g/cm3 (Calculated)
Optical Data of Fedotovite
Type:
Biaxial (+)
RI values:
nα = 1.577 nβ = 1.594 nγ = 1.633
2V:
Measured: 68° , Calculated: 70°
Max Birefringence:
δ = 0.056
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
very weak
Optical Extinction:
Z = b; Y ∧ c ≃ 0°.
Pleochroism:
Visible
Comments:
X = greenish blue; Y = Z = yellow green.
Comments:
Absorption: Z > Y.
Chemistry of Fedotovite
Mindat Formula:
K2Cu3(SO4)3O
Elements listed:
Crystallography of Fedotovite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 19.037(6) Å, b = 9.479(2) Å, c = 14.231(5) Å
β = 111.04°
β = 111.04°
Ratio:
a:b:c = 2.008 : 1 : 1.501
Unit Cell V:
2,396.80 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Crusts of pseudohexagonal flakes.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
|---|---|---|---|---|---|---|---|
| 0014494 | Fedotovite | Starova G L, Filatov S K, Fundamensky V S, Vergasova L P (1991) The crystal structure of fedotovite, K2Cu3O(SO4)3 Mineralogical Magazine 55 613-616 |  | 1991 | Tolbachik fissure eruption, Kamchatka Peninsula, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.83 Å | (100) |
| 6.59 Å | (4) |
| 6.54 Å | (4) |
| 4.405 Å | (3) |
| 4.207 Å | (3) |
| 2.943 Å | (12) |
| 2.844 Å | (5) |
Comments:
Tolbachik volcano, Russia. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45a : [Sulfates, arsenates, selenates, antimonates] | |
| 45b : [Other oxidized fumarolic minerals] |
Geological Setting:
Sublimates around fumaroles.
Type Occurrence of Fedotovite
General Appearance of Type Material:
Aggregates of poorly developed platy to micaceous crystals and fine-grained crusts 1 to 2 mm thick. Crystals are up to 5 mm long x 0.1-1 mm thick, flattened on {100} and irregular in outline. Rarely rectangular or pseudohexagonal.
Place of Conservation of Type Material:
Mining Museum, St. Petersburg, Russia, number 1890/1 (type).
Geological Setting of Type Material:
Fumarole.
Associated Minerals at Type Locality:
Reference:
Vergasova, L.P., Filatov, S.K., Serafimova, Y.K., Starova, G.L. (1988) Fedotovite K2Cu3O(SO4)3 - a new mineral from volcanic sublimates. Doklady Akademii Nauk SSSR: 299: 961-964.
Synonyms of Fedotovite
Other Language Names for Fedotovite
Common Associates
Associated Minerals Based on Photo Data:
| 3 photos of Fedotovite associated with Chalcanthite | CuSO4 · 5H2O |
| 3 photos of Fedotovite associated with Chalcocyanite | CuSO4 |
| 2 photos of Fedotovite associated with Euchlorine | KNaCu3(SO4)3O |
| 1 photo of Fedotovite associated with Dolerophanite | Cu2(SO4)O |
| 1 photo of Fedotovite associated with Kamchatkite | KCu3(SO4)2OCl |
Related Minerals - Strunz-mindat Grouping
| 7.BC. | Adranosite-(Fe) | (NH4)4NaFe3+2(SO4)4Cl(OH)2 |
| 7.BC. | Adranosite | (NH4)4NaAl2(SO4)4Cl(OH)2 |
| 7.BC. | D'Ansite-(Mn) | Na21Mn2+(SO4)10Cl3 |
| 7.BC. | Agaite | Pb3CuTeO5(OH)2(CO3) |
| 7.BC. | D'Ansite-(Fe) | Na21Fe2+(SO4)10Cl3 |
| 7.BC. | Acmonidesite | (NH4,K,Pb)8NaFe2+4(SO4)5Cl8 |
| 7.BC. | Backite | Pb2AlTeO6Cl |
| 7.BC. | Hagstromite | Pb8Cu2+(Te6+O6)2(CO3)Cl4 |
| 7.BC. | Wildcatite | CaFe3+Te6+O5(OH) |
| 7.BC. | Franksousaite | PbCu(Se6+O4)(OH)2 |
| 7.BC. | Zincochenite | Pb4Zn(OH)6(SO4)2 |
| 7.BC. | Viskontite | Pb5Cu2(SO4)3(SeO3)(OH)6 |
| 7.BC.05 | D'Ansite | Na21Mg(SO4)10Cl3 |
| 7.BC.07 | Apatelite | Fe3(SO4)2(OH)5 · 0.5H2O |
| 7.BC.07 | Unnamed (Ba-Fe Vanadate) | Ba, Fe, V, O, H |
| 7.BC.10 | Alunite | KAl3(SO4)2(OH)6 |
| 7.BC.10 | Ammonioalunite | (NH4)Al3(SO4)2(OH)6 |
| 7.BC.10 | Ammoniojarosite | (NH4)Fe3+3(SO4)2(OH)6 |
| 7.BC.10 | Argentojarosite | AgFe3+3(SO4)2(OH)6 |
| 7.BC.10 | Beaverite-(Cu) | Pb(Fe3+2Cu)(SO4)2(OH)6 |
| 7.BC.10 | Dorallcharite | TlFe3+3(SO4)2(OH)6 |
| 7.BC.10 | Huangite | Ca0.5Al3(SO4)2(OH)6 |
| 7.BC.10 | Hydroniumjarosite | (H3O)Fe3+3(SO4)2(OH)6 |
| 7.BC.10 | Jarosite | KFe3+3(SO4)2(OH)6 |
| 7.BC.10 | Natroalunite-2c | (Na,Ca0.5,K)Al3(SO4)2(OH)6 |
| 7.BC.10 | Natroalunite | NaAl3(SO4)2(OH)6 |
| 7.BC.10 | Natrojarosite | NaFe3(SO4)2(OH)6 |
| 7.BC.10 | Osarizawaite | Pb(Al2Cu2+)(SO4)2(OH)6 |
| 7.BC.10 | Plumbojarosite | Pb0.5Fe3+3(SO4)2(OH)6 |
| 7.BC.10 | Schlossmacherite | (H3O)Al3(SO4)2(OH)6 |
| 7.BC.10 | Walthierite | Ba0.5Al3(SO4)2(OH)6 |
| 7.BC.10 | Beaverite-(Zn) | Pb(Fe3+2Zn)(SO4)2(OH)6 |
| 7.BC.15 | Ye'elimite | Ca4Al6(SO4)O12 |
| 7.BC.20 | Atlasovite | K(BiO)Cu6Fe3+(SO4)5O3Cl |
| 7.BC.20 | Nabokoite | KCu7(SO4)5(Te4+O3)OCl |
| 7.BC.20 | Puninite | Na2Cu3O(SO4)3 |
| 7.BC.25 | Chlorothionite | K2Cu(SO4)Cl2 |
| 7.BC.30 | Euchlorine | KNaCu3(SO4)3O |
| 7.BC.35 | Kamchatkite | KCu3(SO4)2OCl |
| 7.BC.40 | Piypite | K4Cu4O2(SO4)4 · (Na,Cu)Cl |
| 7.BC.45 | Klyuchevskite | K3Cu3(Fe3+,Al)(SO4)4O2 |
| 7.BC.45 | Alumoklyuchevskite | K3Cu3(Al,Fe3+)(SO4)4O2 |
| 7.BC.45 | Belousovite | KZn(SO4)Cl |
| 7.BC.47 | Müllerite | Pb2Fe3+(Te6+O6)Cl |
| 7.BC.50 | Caledonite | Pb5Cu2(SO4)3(CO3)(OH)6 |
| 7.BC.50 | Elasmochloite | Na3Cu6BiO4(SO4)5 |
| 7.BC.52 | Eleomelanite | (K2Pb)Cu4O2(SO4)4 |
| 7.BC.55 | Wherryite | Pb7Cu2(SO4)4(SiO4)2(OH)2 |
| 7.BC.55 | Falgarite | K4(VO)3(SO4)5 |
| 7.BC.57 | Krasheninnikovite | KNa2CaMg(SO4)3F |
| 7.BC.60 | Mammothite | Pb6Cu4AlSb5+O2(OH)16Cl4(SO4)2 |
| 7.BC.60 | Wulffite | K3NaCu4O2(SO4)4 |
| 7.BC.60 | Parawulffite | K5Na3Cu8O4(SO4)8 |
| 7.BC.62 | Shuvalovite | K2(Ca2Na)(SO4)3F |
| 7.BC.65 | Linarite | PbCu(SO4)(OH)2 |
| 7.BC.65 | Schmiederite | Pb2Cu2(Se6+O4)(Se4+O3)(OH)4 |
| 7.BC.65 | Munakataite | Pb2Cu2(Se4+O3)(SO4)(OH)4 |
| 7.BC.65 | Therasiaite | (NH4)3KNa2Fe2+Fe3+(SO4)3Cl5 |
| 7.BC.65 | Saccoite | Ca2Mn3+2F(OH)8 · 0.5(SO4) |
| 7.BC.70 | Chenite | Pb4Cu(SO4)2(OH)6 |
| 7.BC.75 | Krivovichevite | Pb3Al(OH)6(SO4)(OH) |
| 7.BC.80 | Anhydrokainite | KMg(SO4)Cl |
Other Information
IR Spectrum:
IR spectrum shows features at 600 cm-1 and 1100 cm-1 due to (SO4)2- groups. An absence of features at 1600 and 3400-3600 cm-1 indicates that no water or hydroxyl is present.
Thermal Behaviour:
DTA curve shows two endothermic effects: one at 692°C with no weight loss (breakdown with formation of tenorite), and another at 715°C with a 20 wt% loss (desulfatization).
Special Storage/
Display Requirements:
Display Requirements:
Unstable in air.
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 Fedotovite
mindat.org URL:
https://www.mindat.org/min-1469.html
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References for Fedotovite
Reference List:
Siidra, Oleg I., Nazarchuk, Evgenii V., Zaitsev, Anatoly N., Lukina, Evgeniya A., Avdontseva, Evgeniya Y., Vergasova, Lidiya P, Vlasenko, Natalia S., Filatov, Stanislav K., Turner, Rick, Karpov, Gennady A. (2017) Copper oxosulphates from fumaroles of Tolbachik volcano: puninite, Na2Cu3O(SO4)3 – a new mineral species and structure refinements of kamchatkite and alumoklyuchevskite. European Journal of Mineralogy, 29 (3) 499-510 doi:10.1127/ejm/2017/0029-2619
Localities for Fedotovite
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) | |
| Vergasova et al. (1988) +1 other reference |
| Pekov et al. (2013) |
| Pekov et al. (2018) | |
| Bykova E Y et al. (1998) | |
| Zelenski et al. (2012) +1 other reference | |
| Sharygin et al. (2018) |
USA | |
| Castor et al. (2004) |
Quick NavTopAbout FedotoviteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Yadovitaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia