Godovikovite Mineral Data

Godovikovite Mineral Data +

General Godovikovite Information

Chemical Formula:

(NH4)(Al,Fe+++)(SO4)2

Composition:

Molecular Weight = 244.36 gm

Aluminum 8.28 % Al 15.65 % Al₂O₃

Iron 5.71 % Fe 8.17 % Fe₂O₃

Hydrogen 1.65 % H - % Calc as (NH₄)₂O

Sulfur 26.24 % S 65.53 % SO₃

Nitrogen 5.73 % N 10.66 % (NH₄)₂O

Oxygen 52.38 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(NH₄)Al_0.75Fe³⁺_0.25(SO₄)₂

IMA Status:

Approved IMA 1988

Locality:

Kopeisk, Chelyabinsk Oblast', Urals Region, Russia Link to MinDat.org Location Data.

Name Origin:

Named for A. A. Godovikov.

Godovikovite Image

Images:

Godovikovite

Comments: A porous aggregate of massive yellow godovikovite.
Location: Carola Mine, Freital, Dresden, Saxony, Germany. Scale: Specimen size 4.2 cm.
© Thomas Witzke / Abraxas-Verlag

Godovikovite Crystallography

Axial Ratios:

a:c = 1:1.74736

Cell Dimensions:

a = 4.75, c = 8.3, Z = 1; V = 162.18 Den(Calc)= 2.50

Crystal System:

Trigonal - TrapezohedralH-M Symbol (3 2) Space Group: P 3₂1

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

By Intensity(I/I_o): 3.69(1), 2.921(0.9), 8.3(0.9),

Physical Properties of Godovikovite

Color:

White, Colorless.

Density:

2.53

Diaphaniety:

Transparent to Translucent

Hardness:

2 - Gypsum

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Godovikovite

Gladstone-Dale:

CI meas= -0.309 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.324 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2306,KPDmeas= 0.2279,KC= 0.1741

Optical Data:

Uniaxial (+), w=1.572, e=1.581, bire=0.0090.

Calculated Properties of Godovikovite

Electron Density:

r_electron=2.55 gm/cc
note: r_Godovikovite=2.53 gm/cc.

Fermion Index

Fermion Index = 0.06054
Boson Index = 0.93946

Photoelectric:

PE_Godovikovite= 3.49 barns/electron
U=PE_Godovikovite x r_electron= 8.91 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Godovikovite is Not Radioactive

Godovikovite Classification

Dana Class:

28.3.5.2 (28)Anhydrous Acid and Sulfates

(28.3)(A++) XO4

(28.3.5)Dana Group

28.3.5.1 Sabieite (NH4)Fe(SO4)2 P 3₂1 3 2

28.3.5.2 Godovikovite (NH4)(Al,Fe)(SO4)2 P 3₂1 3 2

Strunz Class:

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

VI/A - Waterfree sulfates [SO4]2- without unfamiliar anions. cations of medium and very big size

VI/A.05 - Godovikovite - Sabieite series

VI/A.05-10 Godovikovite (NH4)(Al,Fe)(SO4)2 P 3₂1 3 2

VI/A.05-20 Sabieite (NH4)Fe(SO4)2 P 3₂1 3 2

Other Godovikovite 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 Godovikovite :
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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Godovikovite

(NH4)(Al,Fe+++)(SO4)2
Dana No: 28.3.5.2 Strunz No: VI/A.05-10
Locality:

Notes: