Fedotovite Mineral Data

Fedotovite Mineral Data +

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General Fedotovite Information

Chemical Formula:

K2Cu++3(SO4)3O

Composition:

Molecular Weight = 573.02 gm

Potassium 13.65 % K 16.44 % K₂O

Copper 33.27 % Cu 41.64 % CuO

Sulfur 16.79 % S 41.92 % SO₃

Oxygen 36.30 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂Cu₃(SO₄)₃O

IMA Status:

Approved IMA 1988

Locality:

Great Tolbachik fissure eruption, Kamchatka, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for S. A. Fedotov (1931-), Russian geologist.

Synonym:

ICSD 71792

PDF 45-1405

Fedotovite Image

Images:

Fedotovite Dolerophanite Chalcanthite

Comments: Brown crystals of dolerophanite with blue chalcanthite and green fedotovite.
Location: Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Fedotovite Chalcanthite

Comments: Green fedotovite with pale blue chalcanthite.
Location: Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Fedotovite Crystallography

Axial Ratios:

a:b:c =2.0126:1:1.4973

Cell Dimensions:

a = 19.06, b = 9.47, c = 14.18, Z = 8; beta = 112.36° V = 2,367.02 Den(Calc)= 3.22

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 8.83(1), 2.943(0.2), 4.21(0.1),4.41(0.1), 4.54(0.1), 6.54(0.1), 6.59(0.1), 2.844(0.1),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Starova G L , Filatov S K , Fundamensky V S , Vergasova L P , Mineralogical Magazine , 55 (1991) p.613-616, The crystal structure of fedotovite, K2Cu3O(SO4)3, Locality: Tolbachik fissure eruption, Kamchatka Peninsula, Russia, Note: x(S3), z(S3), and z(O11) changed to match bond length table

Physical Properties of Fedotovite

Cleavage:

[???] Perfect

Color:

Blue green, Emerald green.

Density:

3.205

Diaphaniety:

Transparent

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Silky

Streak:

light green

Optical Properties of Fedotovite

Gladstone-Dale:

CI meas= -0.059 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1867,KPDmeas= 0.1876,KC= 0.1772

Optical Data:

Biaxial (+), a=1.577, b=1.594, g=1.633, bire=0.0560, 2V(Calc)=70, 2V(Meas)=68.

Calculated Properties of Fedotovite

Electron Density:

r_electron=3.11 gm/cc
note: r_Fedotovite=3.22 gm/cc.

Fermion Index

Fermion Index = 0.00144
Boson Index = 0.99856

Photoelectric:

PE_Fedotovite= 16.92 barns/electron
U=PE_Fedotovite x r_electron= 52.68 barns/cc.

Radioactivity:

GRapi = 190.37 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Fedotovite - barely detectable

Fedotovite Classification

Dana Class:

30.3.4.1 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.3)with miscellaneous formulae

(30.3.4)Dana Group

30.3.4.1 Fedotovite K2Cu3(SO4)3O P 2₁/c 2/m

Strunz Class:

VI/B.05-10 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/B - Waterfree sulfates [SO4]2- with unfamiliar anions. cations of medium size

VI/B.05 - Fedotovite - Klyuchevskite series

VI/B.05-10 Fedotovite K2Cu3(SO4)3O P 2₁/c 2/m

VI/B.05-20 Chlorothionite K2Cu(SO4)Cl2 P nma 2/m 2/m 2/m

VI/B.05-30 Kamchatkite KCu3OCl(SO4)2 P na2₁ mm2

VI/B.05-40 Piypite K2Cu2(SO4)2O I 4 4

VI/B.05-45 Alumoklyuchevskite K3Cu3AlO2(SO4)4 I2 2

VI/B.05-50 Klyuchevskite K3Cu3(Fe,Al)O2(SO4)4 Unk. Mono

VI/B.05-50* Klyuchevskite-Duplicate K3Cu3FeO2(SO4)4 I2/m, Im, or I2 Mono

Other Fedotovite Information

References:

PHYS. PROP.(Am.Min.,Vol.75,p241,1990) OPTIC PROP.(Am.Min.,Vol.75,p241,1990)

See Also:

Links to other databases for Fedotovite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Fedotovite Specimen Label here :

Fedotovite

K2Cu++3(SO4)3O
Dana No: 30.3.4.1 Strunz No: VI/B.05-10
Locality:

Notes: