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Fedotovite

A valid IMA mineral species
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About FedotoviteHide

05657710015802585637810.jpg
Sergei A. Fedotov
Formula:
K2Cu3(SO4)3O
Colour:
Emerald green to grass green
Lustre:
Vitreous, Silky
Hardness:
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.
Structurally related to euchlorine and puninite.


Unique IdentifiersHide

Mindat ID:
1469
Long-form identifier:
mindat:1:1:1469:0
GUID
(UUID V4):
adb61431-cdf6-4921-968d-8490b1dad9d8

IMA Classification of FedotoviteHide

Classification of FedotoviteHide

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
30.3.4.1

30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)5(XO4)3Zq
25.2.14

25 : Sulphates
2 : Sulphates of Cu and Ag

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
FdtIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of FedotoviteHide

Vitreous, Silky
Transparency:
Transparent
Colour:
Emerald green to grass green
Streak:
Pale grass green
Hardness:
2½ on Mohs scale
Cleavage:
Perfect
on {100}
Density:
3.205(3) g/cm3 (Measured)    3.09 g/cm3 (Calculated)

Optical Data of FedotoviteHide

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.
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 FedotoviteHide

Mindat Formula:
K2Cu3(SO4)3O

Crystallography of FedotoviteHide

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°
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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0014494FedotoviteStarova G L, Filatov S K, Fundamensky V S, Vergasova L P (1991) The crystal structure of fedotovite, K2Cu3O(SO4)3 Mineralogical Magazine 55 613-6161991Tolbachik fissure eruption, Kamchatka Peninsula, Russia0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest 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 FedotoviteHide

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 FedotoviteHide

Other Language Names for FedotoviteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Fedotovite associated with ChalcocyaniteCuSO4
2 photos of Fedotovite associated with ChalcanthiteCuSO4 · 5H2O
1 photo of Fedotovite associated with DolerophaniteCu2(SO4)O
1 photo of Fedotovite associated with EuchlorineKNaCu3(SO4)3O

Related Minerals - Strunz-mindat GroupingHide

7.BC.Adranosite-(Fe)(NH4)4NaFe3+2(SO4)4Cl(OH)2Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
7.BC.Adranosite(NH4)4NaAl2(SO4)4Cl(OH)2Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
7.BC.D'Ansite-(Mn)Na21Mn2+(SO4)10Cl3Iso. 4 3m : I4 3d
7.BC.AgaitePb3CuTeO5(OH)2(CO3) Orth. mm2 : Pca21
7.BC.D'Ansite-(Fe)Na21Fe2+(SO4)10Cl3Iso. 4 3m : I4 3d
7.BC.Acmonidesite(NH4,K,Pb)8NaFe2+4(SO4)5Cl8Orth. 2 2 2 : C2 2 21
7.BC.BackitePb2AlTeO6ClTrig. 3 2 : P3 1 2
7.BC.HagstromitePb8Cu2+(Te6+O6)2(CO3)Cl4Orth. mmm (2/m 2/m 2/m) : Ibam
7.BC.WildcatiteCaFe3+Te6+O5(OH)Trig. 3m (3 2/m) : P3 1m
7.BC.FranksousaitePbCu(Se6+O4)(OH)2Mon. 2/m : P21/m
7.BC.ZincochenitePb4Zn(OH)6(SO4)2Tric. 1 : P1
7.BC.ViskontitePb5Cu2(SO4)3(SeO3)(OH)6Orth. mm2 : Pmn21
7.BC.05D'AnsiteNa21Mg(SO4)10Cl3Iso. 4 3m : I4 3m
7.BC.07ApateliteFe3(SO4)2(OH)5 · 0.5H2O
7.BC.07Unnamed (Ba-Fe Vanadate)Ba, Fe, V, O, H
7.BC.10AluniteKAl3(SO4)2(OH)6Trig. 3m : R3m
7.BC.10Ammonioalunite(NH4)Al3(SO4)2(OH)6Trig.
7.BC.10Ammoniojarosite(NH4)Fe3+3(SO4)2(OH)6Trig. 3m : R3m
7.BC.10ArgentojarositeAgFe3+3(SO4)2(OH)6Trig. 3m : R3m
7.BC.10Beaverite-(Cu)Pb(Fe3+2Cu)(SO4)2(OH)6Trig. 3m (3 2/m) : R3m
7.BC.10DorallchariteTlFe3+3(SO4)2(OH)6Trig. 3m (3 2/m) : R3m
7.BC.10HuangiteCa0.5Al3(SO4)2(OH)6Trig. 3m (3 2/m) : R3m
7.BC.10Hydroniumjarosite(H3O)Fe3+3(SO4)2(OH)6Trig. 3m (3 2/m) : R3m
7.BC.10JarositeKFe3+3(SO4)2(OH)6Trig. 3m (3 2/m) : R3m
7.BC.10Natroalunite-2c(Na,Ca0.5,K)Al3(SO4)2(OH)6Trig. 3m (3 2/m) : R3m
7.BC.10NatroaluniteNaAl3(SO4)2(OH)6Trig. 3m : R3m
7.BC.10NatrojarositeNaFe3(SO4)2(OH)6Trig. 3m : R3m
7.BC.10OsarizawaitePb(Al2Cu2+)(SO4)2(OH)6Trig. 3m (3 2/m) : R3m
7.BC.10PlumbojarositePb0.5Fe3+3(SO4)2(OH)6Trig. 3m (3 2/m) : R3m
7.BC.10Schlossmacherite(H3O)Al3(SO4)2(OH)6Trig. 3m (3 2/m) : R3m
7.BC.10WalthieriteBa0.5Al3(SO4)2(OH)6Trig.
7.BC.10Beaverite-(Zn)Pb(Fe3+2Zn)(SO4)2(OH)6Trig. 3m (3 2/m) : R3m
7.BC.15Ye'elimiteCa4Al6(SO4)O12Iso. 4 3 2 : I41 3 2
7.BC.20AtlasoviteK(BiO)Cu6Fe3+(SO4)5O3ClTet. 4/mmm (4/m 2/m 2/m) : P4/ncc
7.BC.20NabokoiteKCu7(SO4)5(Te4+O3)OClTet. 4/mmm (4/m 2/m 2/m) : P4/ncc
7.BC.20PuniniteNa2Cu3O(SO4)3Mon. 2/m : B2/b
7.BC.25ChlorothioniteK2Cu(SO4)Cl2Orth. mmm (2/m 2/m 2/m) : Pnma
7.BC.30EuchlorineKNaCu3(SO4)3OMon. 2/m
7.BC.35KamchatkiteKCu3(SO4)2OClOrth. mmm (2/m 2/m 2/m) : Pnma
7.BC.40PiypiteK4Cu4O2(SO4)4 · (Na,Cu)ClTet. 4 : I4
7.BC.45KlyuchevskiteK3Cu3(Fe3+,Al)(SO4)4O2Mon. 2
7.BC.45AlumoklyuchevskiteK3Cu3(Al,Fe3+)(SO4)4O2Tric. 1 : P1
7.BC.45BelousoviteKZn(SO4)ClMon. 2/m : P21/b
7.BC.47MülleritePb2Fe3+(Te6+O6)ClTrig. 3 2 : P31 1 2
7.BC.50CaledonitePb5Cu2(SO4)3(CO3)(OH)6Orth. mm2 : Pmn21
7.BC.50ElasmochloiteNa3Cu6BiO4(SO4)5Mon. 2/m
7.BC.52Eleomelanite(K2Pb)Cu4O2(SO4)4Mon. 2/m
7.BC.55WherryitePb7Cu2(SO4)4(SiO4)2(OH)2Mon. 2/m : B2/m
7.BC.55FalgariteK4(VO)3(SO4)5Mon. 2/m : B2/b
7.BC.57KrasheninnikoviteKNa2CaMg(SO4)3FHex. 6/mmm (6/m 2/m 2/m) : P63/mcm
7.BC.60MammothitePb6Cu4AlSb5+O2(OH)16Cl4(SO4)2Mon. 2 : B2
7.BC.60WulffiteK3NaCu4O2(SO4)4Orth. mm2
7.BC.60ParawulffiteK5Na3Cu8O4(SO4)8Mon. 2/m : P2/b
7.BC.62ShuvaloviteK2(Ca2Na)(SO4)3FOrth. mmm (2/m 2/m 2/m) : Pnma
7.BC.65LinaritePbCu(SO4)(OH)2Mon. 2/m : P21/m
7.BC.65SchmiederitePb2Cu2(Se6+O4)(Se4+O3)(OH)4Mon. 2/m : P21/m
7.BC.65MunakataitePb2Cu2(Se4+O3)(SO4)(OH)4Mon. 2/m : P21/m
7.BC.65Therasiaite(NH4)3KNa2Fe2+Fe3+(SO4)3Cl5Mon. m : Bb
7.BC.65SaccoiteCa2Mn3+2F(OH)8 · 0.5(SO4)Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
7.BC.70ChenitePb4Cu(SO4)2(OH)6Tric. 1 : P1
7.BC.75KrivovichevitePb3Al(OH)6(SO4)(OH)Trig. 3m : R3c
7.BC.80AnhydrokainiteKMg(SO4)Cl

Other InformationHide

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:
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 FedotoviteHide

References for FedotoviteHide

Localities for FedotoviteHide

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 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Kamchatka Krai
    • Milkovsky District
      • Tolbachik Volcanic field
Vergasova et al. (1988) +1 other reference
          • Northern Breakthrough (North Breach)
Pekov et al. (2013)
Pekov et al. (2018)
Bykova E Y et al. (1998)
Zelenski et al. (2012) +1 other reference
        • Plosky Tolbachik Volcano
Sharygin et al. (2018)
USA
 
  • Nevada
    • Churchill County
      • Table Mountain Mining District
        • Cottonwood Canyon
          • Bolivia
Castor et al. (2004)
 
矿物 and/or 产地  
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