Fedotovite Mineral Data

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 41.65 % 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.

Name Pronunciation:

Fedotovite + Pronunciation

Synonym:

ICSD 71792

PDF 45-1405

Fedotovite Image

Images:

Dolerophanite Chalcanthite Fedotovite

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 - Prismatic H-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),

Physical Properties of Fedotovite

Cleavage:

{???} Perfect

Color:

Blue green, Emerald green.

Density:

3.205

Diaphaneity:

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
Ncalc = 1.57

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:

Bulk Density (Electron Density)=3.11 gm/cc
note: Specific Gravity of Fedotovite =3.22 gm/cc.

Fermion Index:

Fermion Index = 0.0014496839
Boson Index = 0.9985503161

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)
Concentration of Fedotovite per GRapi unit = 0.53 (%)

Estimated Radioactivity from Fedotovite - barely detectable

Fedotovite Classification

Dana Class:

30.03.04.01 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.03)with miscellaneous formulae

(30.03.04)Dana Group

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

Strunz Class:

07.BC.30 07 - SULFATES (SELENATES, TELLURATES)

07.B - Sulfates (selenates, etc.) with Additional Anions, without H2O

07.BC -With medium-sized and large cations

07.BC.30 Euchlorine KNaCu3(SO4)3O C 2/c 2/m

07.BC.30 Fedotovite K2Cu3(SO4)3O P 2₁/c 2/m

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Fedotovite

K2Cu++3(SO4)3O
Dana No: 30.03.04.01 Strunz No: 07.BC.30
Locality:

Notes:

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