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Stepanovite

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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 (1880-1947), director Coal Geology Division, Institute of Geological Sciences (Moscow).
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.


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Classification of StepanoviteHide

Approved, 'Grandfathered' (first described prior to 1959)
10.AB.20

10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : Oxalates
50.1.7.1

50 : ORGANIC COMPOUNDS
1 : Oxalates
31.1.8

31 : Oxalates, Citrates, Mellitates and Acetates
1 : Oxalates

Physical Properties of StepanoviteHide

Vitreous
Colour:
Light green
Hardness:

Optical Data of StepanoviteHide

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.
Surface Relief:
Moderate

Chemical Properties of StepanoviteHide

Formula:
NaMgFe3+(C2O4)3 · 8-9H2O

Synthetic material (identical to the natural one): Na[Mg(H2O)6][Fe(C2O4)3]·3H2O

Crystallography of StepanoviteHide

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)
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

Type Occurrence of StepanoviteHide

General Appearance of Type Material:
{0001}, {11_20}, {01_12},
{10_14}, and {5_142} forms; xenomorphic grains
Geological Setting of Type Material:
thin veinlets in coal
Associated Minerals at Type Locality:

Other Language Names for StepanoviteHide

German:Stepanovit
Spanish:Stepanovita

Related Minerals - Nickel-Strunz GroupingHide

10.AB.05HumboldtineFe2+(C2O4) · 2H2OMon. 2/m
10.AB.05LindbergiteMn2+(C2O4) · 2H2OMon. 2/m
10.AB.10GlushinskiteMg(C2O4) · 2H2OMon.
10.AB.15MoolooiteCu(C2O4) · 0.4H2OOrth.
10.AB.25MinguzziteK3Fe3+(C2O4)3 · 3H2OMon. 2/m : P21/b
10.AB.30WheatleyiteNa2Cu(C2O4)2 · 2H2OTric.
10.AB.35ZhemchuzhnikoviteNaMgAl(C2O4)3 · 8H2OTrig. 3m : P3c1
10.AB.40WeddelliteCa(C2O4) · (2.5-x)H2OTet. 4/m : I4/m
10.AB.45WhewelliteCa(C2O4) · H2OMon. 2/m : P21/b
10.AB.50CaoxiteCa(C2O4) · 3H2OTric.
10.AB.55Oxammite(NH4)2(C2O4) · H2OOrth. 2 2 2 : P21 21 2
10.AB.60NatroxalateNa2(C2O4)Mon.
10.AB.65Coskrenite-(Ce)(Ce,Nd,La)2(C2O4)(SO4)2 · 12H2OTric.
10.AB.70Levinsonite-(Y)(Y,Nd,La)Al(C2O4)(SO4)2 · 12H2OMon. 2/m
10.AB.75Zugshunstite-(Ce)(Ce,Nd,La)Al(C2O4)(SO4)2 · 12H2OMon.
10.AB.80NovgorodovaiteCa2(C2O4)Cl2 · 2H2OMon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

50.1.7.2ZhemchuzhnikoviteNaMgAl(C2O4)3 · 8H2OTrig. 3m : P3c1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

31.1.1Oxammite(NH4)2(C2O4) · H2OOrth. 2 2 2 : P21 21 2
31.1.2MoolooiteCu(C2O4) · 0.4H2OOrth.
31.1.3WheatleyiteNa2Cu(C2O4)2 · 2H2OTric.
31.1.4GlushinskiteMg(C2O4) · 2H2OMon.
31.1.5WhewelliteCa(C2O4) · H2OMon. 2/m : P21/b
31.1.6WeddelliteCa(C2O4) · (2.5-x)H2OTet. 4/m : I4/m
31.1.7HumboldtineFe2+(C2O4) · 2H2OMon. 2/m
31.1.9ZhemchuzhnikoviteNaMgAl(C2O4)3 · 8H2OTrig. 3m : P3c1
31.1.10MinguzziteK3Fe3+(C2O4)3 · 3H2OMon. 2/m : P21/b

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for StepanoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nefedov, Y.L. (1953), Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 82: 311.
Knipovich, Yu.N., Komkov, A.I. and Nefedov, E.I. (1963): On stepanovite and the new mineral zhemchuzhnikovite. Trudy Vses. Nauchno-Issled. Geol. Inst. (V.S.E.G.E.I.), 96, 131-135 (in Russian).
American Mineralogist (1964): 49: 442-443. [http://rruff.info/rruff_1.0/uploads/AM49_439.pdf; abstract; also with note on possibly misprinted cell parameter a]
Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)
Piro, O.E., Echeverría, G.A., González-Baró, A.C., Baran, E.J. (2016): Crystal and molecular structure and spectroscopic behavior of isotypic synthetic analogs of the oxalate minerals stepanovite and zhemchuzhnikovite. Physics and Chemistry of Minerals, 43, 287-300.

Internet Links for StepanoviteHide

Localities for StepanoviteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia
 
  • Eastern-Siberian Region
    • Sakha Republic (Saha Republic; Yakutia)
      • Polar Yakutia
        • Bulun District
          • Lena River Basin
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Nefedov E I (1953) Report on new minerals discovered by him p.317 in V. A. Mokievsky. The scientific session of the Federov Institute together with the All-Union Mineralogical Society, Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 82, issue 4, 311-317
Mineral and/or Locality  
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