Stepanovite
A valid IMA mineral species - grandfathered
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About Stepanovite
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 |
---|---|
- Å | () |
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
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 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.
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