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Stepanovite

A valid IMA mineral species - grandfathered
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About StepanoviteHide

06593410015144845659979.jpg
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).
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.


Unique IdentifiersHide

Mindat ID:
3763
Long-form identifier:
mindat:1:1:3763:7
GUID
(UUID V4):
711e2ec3-90a2-454e-aba2-d88a2e9211bc

IMA Classification of StepanoviteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
NaMgFe3+(C2O4)3 · 9H2O

Classification of StepanoviteHide

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
StpnIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

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

Chemistry of StepanoviteHide

Mindat 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)
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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
- Å()
Comments:
A powder XRD plot is given in Huskić et al (2016), but there are no published tabulated data.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere<0.6
50 : Coal and/or oil shale minerals<0.36

Type Occurrence of StepanoviteHide

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 StepanoviteHide

German:Stepanovit
Spanish:Stepanovita

Related Minerals - Strunz-mindat GroupingHide

10.AB.Deveroite-(Ce)Ce2(C2O4)3 · 10H2OMon. 2/m : P21/b
10.AB.XFalottaiteMnC2O4 · 3H2OOrth. mmm (2/m 2/m 2/m)
10.AB.Uroxite [(UO2)2(C2O4)(OH)2(H2O)2] · H2OMon. 2/m : P21/b
10.AB.AndreybulakhiteNi(C2O4) · 2H2OMon. 2/m : B2/b
10.AB.EdwindavisiteCu(C2O4)(NH3)Orth. mmm (2/m 2/m 2/m) : Pbca
10.AB.05HumboldtineFe2+(C2O4) · 2H2OMon. 2/m
10.AB.05LindbergiteMn2+(C2O4) · 2H2OMon. 2/m
10.AB.05KatsarositeZn(C2O4) · 2H2OMon. 2/m : B2/b
10.AB.10GlushinskiteMg(C2O4) · 2H2OMon. 2/m : B2/b
10.AB.15MoolooiteCu(C2O4) · nH2OOrth.
10.AB.25MinguzziteK3Fe3+(C2O4)3 · 3H2OMon. 2/m : P21/b
10.AB.30WheatleyiteNa2Cu(C2O4)2 · 2H2OTric. 1 : P1
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.47FiemmeiteCu2(C2O4)(OH)2 · 2H2OMon. 2/m : P21/b
10.AB.50CaoxiteCa(C2O4) · 3H2OTric. 1 : P1
10.AB.50MiddlebackiteCu2C2O4(OH)2Mon. 2/m : P21/b
10.AB.52Metauroxite(UO2)2(C2O4)(OH)2(H2O)2Tric. 1 : P1
10.AB.55Oxammite(NH4)2(C2O4) · H2OOrth. 2 2 2 : P21 21 2
10.AB.60NatroxalateNa2(C2O4)Mon. 2/m : P21/b
10.AB.60Phoxite(NH4)2Mg2(C2O4)(PO3OH)2(H2O)4Mon. 2/m : P21/b
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. 2/m : B2/b
10.AB.80NovgorodovaiteCa2(C2O4)Cl2 · 2H2OMon. 2/m

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.

Internet Links for StepanoviteHide

References for StepanoviteHide

Reference List:

Localities for StepanoviteHide

ⓘ - 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.
Russia
 
  • Sakha
    • Polar Yakutia
      • Bulun District
        • Lena River Basin
Knipovich et al. (1963) +2 other references
Nefedov E I (1953) +1 other reference
 
矿物 and/or 产地  
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