Stepanovite
A valid IMA mineral species - grandfathered
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About Stepanovite
Pavel I. Stepanov
Formula:
NaMgFe3+(C2O4)3 · 8-9H2O
Synthetic material (identical to the natural one): Na[Mg(H2O)6][Fe(C2O4)3]·3H2O
Colour:
Light green
Lustre:
Vitreous
Hardness:
2
Crystal System:
Trigonal
Name:
Named after Pavel Ivanovich Stepanov (Павел Иванович Степанов) (4 (16) June 1880, Tara, Russian Empire - 26 August 1947, Moscow, USSR), director Coal Geology Division, Institute of Geological Sciences (Moscow).
Type Locality:
Isostructural with:
The Fe analogue of zhemchuzhnikovite. Unique combination of elements.
The originally reported unit cell is a sub-cell, with correct space group and unit cell based on weak superstructure reflections.
The originally reported unit cell is a sub-cell, with correct space group and unit cell based on weak superstructure reflections.
Unique Identifiers
Mindat ID:
3763
Long-form identifier:
mindat:1:1:3763:7
GUID
(UUID V4):
(UUID V4):
711e2ec3-90a2-454e-aba2-d88a2e9211bc
IMA Classification of Stepanovite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
NaMgFe3+(C2O4)3 · 9H2O
Classification of Stepanovite
10.AB.20
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : Oxalates
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : Oxalates
50.1.7.1
50 : ORGANIC COMPOUNDS
1 : Oxalates
50 : ORGANIC COMPOUNDS
1 : Oxalates
31.1.8
31 : Oxalates, Citrates, Mellitates and Acetates
1 : Oxalates
31 : Oxalates, Citrates, Mellitates and Acetates
1 : Oxalates
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 |
|---|---|---|
| Stpn | 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 Stepanovite
Optical Data of Stepanovite
Type:
Uniaxial (-)
RI values:
nω = 1.515 nε = 1.417
Max Birefringence:
δ = 0.098
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Chemistry of Stepanovite
Mindat Formula:
NaMgFe3+(C2O4)3 · 8-9H2O
Synthetic material (identical to the natural one): Na[Mg(H2O)6][Fe(C2O4)3]·3H2O
Synthetic material (identical to the natural one): Na[Mg(H2O)6][Fe(C2O4)3]·3H2O
Crystallography of Stepanovite
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
P3c1
Setting:
P3c1
Cell Parameters:
a = 9.28 Å, c = 36.67 Å
Ratio:
a:c = 1 : 3.952
Unit Cell V:
2,734.88 ų (Calculated from Unit Cell)
Morphology:
Forms: {0001}, {1120}, {0112}, {1014}, and {5142}.
Comment:
Note: American Mineralogist (1964) 49, 442-443 says in a note: "data given for a:c and Z are inconsistent with the value a 9.28 kX; perhaps it is a typographical error for a 9.78 kX."; Space group for the synthetic material, that has been shown to be identical to the natural one; parameters for the synthetic material: a=17.0483, c=12.4218
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| - Ã… | () |
Comments:
A powder XRD plot is given in Huskić et al (2016), but there are no published tabulated data.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 50 : Coal and/or oil shale minerals | <0.36 |
Type Occurrence of Stepanovite
General Appearance of Type Material:
Yellowish-green granular aggregates; also as xenomorphic grains.
Place of Conservation of Type Material:
Mining Museum, St. Petersburg, Russia, number 1659/1 (type).
Geological Setting of Type Material:
Thin veinlets in coal.
Associated Minerals at Type Locality:
Other Language Names for Stepanovite
German:Stepanovit
Spanish:Stepanovita
Related Minerals - Strunz-mindat Grouping
| 10.AB. | Deveroite-(Ce) | Ce2(C2O4)3 · 10H2O |
| 10.AB.X | Falottaite | MnC2O4 · 3H2O |
| 10.AB. | Uroxite | [(UO2)2(C2O4)(OH)2(H2O)2] · H2O |
| 10.AB. | Andreybulakhite | Ni(C2O4) · 2H2O |
| 10.AB. | Edwindavisite | Cu(C2O4)(NH3) |
| 10.AB.05 | Humboldtine | Fe2+(C2O4) · 2H2O |
| 10.AB.05 | Lindbergite | Mn2+(C2O4) · 2H2O |
| 10.AB.05 | Katsarosite | Zn(C2O4) · 2H2O |
| 10.AB.10 | Glushinskite | Mg(C2O4) · 2H2O |
| 10.AB.15 | Moolooite | Cu(C2O4) · nH2O |
| 10.AB.25 | Minguzzite | K3Fe3+(C2O4)3 · 3H2O |
| 10.AB.30 | Wheatleyite | Na2Cu(C2O4)2 · 2H2O |
| 10.AB.35 | Zhemchuzhnikovite | NaMgAl(C2O4)3 · 8H2O |
| 10.AB.40 | Weddellite | Ca(C2O4) · (2.5-x)H2O |
| 10.AB.45 | Whewellite | Ca(C2O4) · H2O |
| 10.AB.47 | Fiemmeite | Cu2(C2O4)(OH)2 · 2H2O |
| 10.AB.50 | Caoxite | Ca(C2O4) · 3H2O |
| 10.AB.50 | Middlebackite | Cu2C2O4(OH)2 |
| 10.AB.52 | Metauroxite | (UO2)2(C2O4)(OH)2(H2O)2 |
| 10.AB.55 | Oxammite | (NH4)2(C2O4) · H2O |
| 10.AB.60 | Natroxalate | Na2(C2O4) |
| 10.AB.60 | Phoxite | (NH4)2Mg2(C2O4)(PO3OH)2(H2O)4 |
| 10.AB.65 | Coskrenite-(Ce) | (Ce,Nd,La)2(C2O4)(SO4)2 · 12H2O |
| 10.AB.70 | Levinsonite-(Y) | (Y,Nd,La)Al(C2O4)(SO4)2 · 12H2O |
| 10.AB.75 | Zugshunstite-(Ce) | (Ce,Nd,La)Al(C2O4)(SO4)2 · 12H2O |
| 10.AB.80 | Novgorodovaite | Ca2(C2O4)Cl2 · 2H2O |
Other Information
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 Stepanovite
mindat.org URL:
https://www.mindat.org/min-3763.html
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References for Stepanovite
Reference List:
IMA (1967) International Mineralogical Association: Commission on New Minerals and Mineral Names. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (277) 131-136 doi:10.1180/minmag.1967.036.277.20
Localities for Stepanovite
ⓘ - 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.
- 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.
Russia | |
| Knipovich et al. (1963) +2 other references |
| Nefedov E I (1953) +1 other reference |
Chai-Tumus coal deposits, Lena River Basin, Bulun District, Polar Yakutia, Sakha, Russia