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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
System:
Trigonal
Colour:
Light green
Hardness:
2
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.

Classification of Stepanovite

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
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Type Occurrence of Stepanovite

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:

Physical Properties of Stepanovite

Vitreous
Colour:
Light green
Hardness (Mohs):
2

Crystallography of Stepanovite

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
P3c1
Space Group Setting:
P3c1
Cell Parameters:
a = 9.28Å, c = 36.67Å
Ratio:
a:c = 1 : 3.952
Unit Cell Volume:
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

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.
Surface Relief:
Moderate

Chemical Properties of Stepanovite

Formula:
NaMgFe3+(C2O4)3 · 8-9H2O

Synthetic material (identical to the natural one): Na[Mg(H2O)6][Fe(C2O4)3]·3H2O
All elements listed in formula:
Analytical Data:
Readily soluble in water.
C2O4 50.36
Al 0.00
Fe3+ 10.78
Fe2+ 0.00
Mg 4.68
Na 4.48
K 0.00
H2O 29.73

total 100.03

Relationship of Stepanovite to other Species

10.AB.05HumboldtineFe2+(C2O4) · 2H2O
10.AB.05LindbergiteMn2+(C2O4) · 2H2O
10.AB.10GlushinskiteMg(C2O4) · 2H2O
10.AB.15MoolooiteCu(C2O4) · 0.4H2O
10.AB.25MinguzziteK3Fe3+(C2O4)3 · 3H2O
10.AB.30WheatleyiteNa2Cu(C2O4)2 · 2H2O
10.AB.35ZhemchuzhnikoviteNaMgAl(C2O4)3 · 8H2O
10.AB.40WeddelliteCa(C2O4) · (2.5-x)H2O
10.AB.45WhewelliteCa(C2O4) · H2O
10.AB.50CaoxiteCa(C2O4) · 3H2O
10.AB.55Oxammite(NH4)2(C2O4) · H2O
10.AB.60NatroxalateNa2(C2O4)
10.AB.65Coskrenite-(Ce)(Ce,Nd,La)2(C2O4)(SO4)2 · 12H2O
10.AB.70Levinsonite-(Y)(Y,Nd,La)Al(C2O4)(SO4)2 · 12H2O
10.AB.75Zugshunstite-(Ce)(Ce,Nd,La)Al(C2O4)(SO4)2 · 12H2O
10.AB.80NovgorodovaiteCa2(C2O4)Cl2 · 2H2O
31.1.1Oxammite(NH4)2(C2O4) · H2O
31.1.2MoolooiteCu(C2O4) · 0.4H2O
31.1.3WheatleyiteNa2Cu(C2O4)2 · 2H2O
31.1.4GlushinskiteMg(C2O4) · 2H2O
31.1.5WhewelliteCa(C2O4) · H2O
31.1.6WeddelliteCa(C2O4) · (2.5-x)H2O
31.1.7HumboldtineFe2+(C2O4) · 2H2O
31.1.9ZhemchuzhnikoviteNaMgAl(C2O4)3 · 8H2O
31.1.10MinguzziteK3Fe3+(C2O4)3 · 3H2O

Other Names for Stepanovite

Name in Other Languages:
German:Stepanovit
Spanish:Stepanovita

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.

References for Stepanovite

Reference List:
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 Stepanovite

Localities for Stepanovite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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