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Godovikovite
A valid IMA mineral species
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About Godovikovite
Aleksandr A. Godovikov
Formula:
(NH4)Al(SO4)2
Type material Fe-bearing.
Colour:
White, colorless in thin section
Lustre:
Dull
Hardness:
2
Specific Gravity:
2.53
Crystal System:
Trigonal
Name:
Named in honor of Aleksandr Aleksandrovich Godovikov (Александр Александрович Годовиков) (1927-1995), Russian mineralogist and Director of the Fersman Mineralogical Museum, Moscow, Russia.
Type Locality:
Isostructural with:
The Al analogue of sabieite and the NH4 analogue of steklite.
Hydrates to tschermigite at room temperature. Slightly hygroscopic; dissolves slowly in water.
May occur in burning coal dumps as a dehydration product of tschermigite.
Hydrates to tschermigite at room temperature. Slightly hygroscopic; dissolves slowly in water.
May occur in burning coal dumps as a dehydration product of tschermigite.
Unique Identifiers
Mindat ID:
1717
Long-form identifier:
mindat:1:1:1717:2
IMA Classification of Godovikovite
Approved
IMA Formula:
(N3-H4)Al(S6+O4)2
Approval year:
1987
First published:
1988
Classification of Godovikovite
7.AC.20
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations
28.3.5.2
28 : ANHYDROUS ACID AND NORMAL SULFATES
3 : AXO4
28 : ANHYDROUS ACID AND NORMAL SULFATES
3 : AXO4
25.11.18
25 : Sulphates
11 : Sulphates of Fe and other metals
25 : Sulphates
11 : Sulphates of Fe and other metals
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 for Standard |
|---|---|---|
| God | 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 Godovikovite
Dull
Transparency:
Translucent
Colour:
White, colorless in thin section
Streak:
White
Hardness:
2 on Mohs scale
Fracture:
Irregular/Uneven
Density:
2.53 g/cm3 (Measured) 2.52 g/cm3 (Calculated)
Optical Data of Godovikovite
Type:
Uniaxial (+)
RI values:
nω = 1.572(2) nε = 1.581(2)
Max. Birefringence:
δ = 0.009
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Chemistry of Godovikovite
Mindat Formula:
(NH4)Al(SO4)2
Type material Fe-bearing.
Type material Fe-bearing.
Element Weights:
Crystallography of Godovikovite
Crystal System:
Trigonal
Class (H-M):
32 - Trapezohedral
Space Group:
P321
Cell Parameters:
a = 4.75(1) Å, c = 8.30(1) Å
Ratio:
a:c = 1 : 1.747
Unit Cell V:
162.18 ų (Calculated from Unit Cell)
Z:
1
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.69 Å | (100) |
| 8.30 Å | (90) |
| 2.921 Å | (90) |
| 2.374 Å | (80) |
| 2.764 Å | (70) |
| 1.848 Å | (70) |
| 2.280 Å | (60) |
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] | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 50 : Coal and/or oil shale minerals | <0.36 |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 54 : Coal and other mine fire minerals (see also #51 and #56) |
Type Occurrence of Godovikovite
General Appearance of Type Material:
White, compact or porous chalky aggregates of fine hairs, 0.001 to 0.015 mm in size.
Place of Conservation of Type Material:
1) Il’menskii Preserve Museum, Miass, 5894.
2) A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 87566.
2) A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 87566.
Geological Setting of Type Material:
Burning coal mine dumps
Synonyms of Godovikovite
Other Language Names for Godovikovite
Common Associates
Associations Based on Photo Data:
| 4 photos of Godovikovite associated with Millosevichite | Al2(SO4)3 |
| 3 photos of Godovikovite associated with Tschermigite | (NH4)Al(SO4)2 · 12H2O |
| 1 photo of Godovikovite associated with Efremovite | (NH4)2Mg2(SO4)3 |
| 1 photo of Godovikovite associated with Ammonioalunite | (NH4)Al3(SO4)2(OH)6 |
| 1 photo of Godovikovite associated with Sabieite | (NH4)Fe3+(SO4)2 |
Related Minerals - Strunz-mindat Grouping
| 7.AC. | Aluminopyracmonite | (NH4)3Al(SO4)3 |
| 7.AC. | Amgaite | Tl+32Te6+O6 |
| 7.AC.05 | Vanthoffite | Na6Mg(SO4)4 |
| 7.AC.08 | Pyracmonite | (NH4)3Fe(SO4)3 |
| 7.AC.10 | Langbeinite | K2Mg2(SO4)3 |
| 7.AC.10 | Efremovite | (NH4)2Mg2(SO4)3 |
| 7.AC.10 | Ferroefremovite | (NH4)2Fe2+2(SO4)3 |
| 7.AC.10 | Manganolangbeinite | K2Mn2(SO4)3 |
| 7.AC.15 | Yavapaiite | KFe3+(S6+O4)2 |
| 7.AC.15 | Eldfellite | NaFe3+(SO4)2 |
| 7.AC.20 | Sabieite | (NH4)Fe3+(SO4)2 |
| 7.AC.20 | Steklite | KAl(SO4)2 |
| 7.AC.35 | Aphthitalite | K3Na(SO4)2 |
| 7.AC.35 | Belomarinaite | KNa(SO4) |
| 7.AC.35 | Natroaphthitalite | KNa3(SO4)2 |
| 7.AC.35 | Möhnite | (NH4)K2Na(SO4)2 |
| 7.AC.40 | Itelmenite | Na4Mg3Cu3(SO4)8 |
| 7.AC.45 | Saranchinaite | Na2Cu(SO4)2 |
| 7.AC.50 | Majzlanite | K2Na(ZnNa)Ca(SO4)4 |
| 7.AC.60 | Philoxenite | (K,Na,Pb)4(Na,Ca)2(Mg,Cu)3(Fe3+0.5Al0.5)(SO4)8 |
| 7.AC.75 | Petrovite | Na12Cu2(SO4)8 |
Other Information
Notes:
Slowly soluble in H2O.
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 Godovikovite
mindat.org URL:
https://www.mindat.org/min-1717.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Godovikovite
Reference List:
Localities for Godovikovite
Showing 25 localities.
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.
Bulgaria | |
| Elena Shcherbakova (2010) |
China | |
| Geological Society of America Abstracts ... |
| Am Min 90:1729-1739 | |
Czech Republic | |
| Žáček et al. (1995) |
| Hyrsl J. +2 other references |
| Sejkora et al. (2001) |
| Matýsek et al. (2022) |
| Košek (2018) +1 other reference | |
Germany | |
| Sindern et al. (2005) +1 other reference |
| Košek (2018) +1 other reference | |
| Thalheim +1 other reference |
| Witzke et al. (1998) |
Hungary | |
| Szakáll et al. (2008) |
Italy | |
| Russo et al. (2017) |
| Camostrini et al. (2010) |
Japan | |
| SHIMOBAYASHI et al. (2011) |
Poland | |
| Parafiniuk et al. (2009) |
| Ł. Kruszewski (PXRD data) |
| doi.org (n.d.) +1 other reference |
| Ł. Kruszewski (PXRD data) |
Russia (TL) | |
| Shcherbakova et al. (1988) +2 other references |
Tajikistan | |
| D.I.Belakovskiy data |
| rruff.geo.arizona.edu (n.d.) |
USA | |
| Kampf et al. (2024) |
| Finkelman et al. (1977) |
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"Bocca Grande" fumarole, Solfatara di Pozzuoli, Pozzuoli, Metropolitan City of Naples, Campania, Italy