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Wheatleyite

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About WheatleyiteHide

Formula:
Na2Cu(C2O4)2 · 2H2O
Colour:
Bright blue
Lustre:
Vitreous
Hardness:
1 - 2
Specific Gravity:
2.27
Crystal System:
Triclinic
Name:
Named after its discovery locality, the Wheatley Mines, Phoenixville, Pennsylvania, USA.
The second Na-Cu oxalate mineral after antipinite (that also contains K). Compare other Cu-bearing oxalate minerals - middlebackite, moolooite, and fiemmeite.


Classification of WheatleyiteHide

Approved
Approval Year:
1984
First Published:
1986
9/A.01-100
10.AB.30

10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : Oxalates
50.1.8.1

50 : ORGANIC COMPOUNDS
1 : Oxalates
31.1.3

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

Physical Properties of WheatleyiteHide

Vitreous
Transparency:
Transparent
Colour:
Bright blue
Streak:
Light blue
Hardness:
1 - 2 on Mohs scale
Tenacity:
Very brittle
Cleavage:
Perfect
{100}
Density:
2.27 g/cm3 (Measured)    2.250 g/cm3 (Calculated)

Optical Data of WheatleyiteHide

Type:
Biaxial (+)
RI values:
nα = 1.400 nβ = 1.499 nγ = 1.667
2V:
Measured: 83° , Calculated: 84°
Max Birefringence:
δ = 0.267
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none
Comments:
X = colorless; Y = very pale blue; Z = intense dark blue.

Chemical Properties of WheatleyiteHide

Formula:
Na2Cu(C2O4)2 · 2H2O

Crystallography of WheatleyiteHide

Crystal System:
Triclinic
Cell Parameters:
a = 7.54 Å, b = 9.48 Å, c = 3.58 Å
α = 81.9°, β = 103.67°, γ = 107.94°
Ratio:
a:b:c = 0.795 : 1 : 0.378
Unit Cell V:
235.91 ų (Calculated from Unit Cell)
Twinning:
Sometimes observed on the single-crystal diffraction photographs, but the twin law was not determined.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.539 (100)
3.169 (90)
7.045 (80)
3.655 (50)
2.799 (40)
2.538 (30)
2.497 (30)

Type Occurrence of WheatleyiteHide

Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Canada, 80196.
National Museum of Natural History, Washington, D.C., USA, 162531.
Geological Setting of Type Material:
Vein-type lead-zinc deposit.
Associated Minerals at Type Locality:

Synonyms of WheatleyiteHide

Other Language Names for WheatleyiteHide

German:Wheatleyit
Spanish:Wheatleyita

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.20StepanoviteNaMgFe3+(C2O4)3 · 8-9H2OTrig. 3m : P3c1
10.AB.25MinguzziteK3Fe3+(C2O4)3 · 3H2OMon. 2/m : P21/b
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 - 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.
31.1.4GlushinskiteMg(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
31.1.8StepanoviteNaMgFe3+(C2O4)3 · 8-9H2OTrig. 3m : P3c1
31.1.9ZhemchuzhnikoviteNaMgAl(C2O4)3 · 8H2OTrig. 3m : P3c1
31.1.10MinguzziteK3Fe3+(C2O4)3 · 3H2OMon. 2/m : P21/b

Fluorescence of WheatleyiteHide

None observed.

Other InformationHide

Notes:
Water soluble.
Special Storage/
Display Requirements:
Must be kept dry.
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 WheatleyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chananont, P., Nixon, P.E., Waters, J.M., Water, T.N. (1980) The structure of disodium catena-bis(µ-oxalato)-cuprate(II) dihydrate. Acta Crystallographica: B36: 2145-2147.
Gleizes, A., Maury, F., Galy, J. (1980) Crystal structure and magnetism of solum bis(oxalato)cuprate(II) dihydrate, Na2Cu(C2O4)2·2H2O. A deductive proposal for the structure of copper oxalate, CuC2O4·xH2O (0 < x < 1). Inorganic Chemistry: 19: 2074-2078.
Rouse, R.C., Peacor, D.R., Dunn, P.J., Simmons, W.B., Newbury, D. (1986) Wheatleyite, Na2Cu(C2O4)2·2H2O, a natural sodium copper salt of oxalic acid. American Mineralogist: 71: 1240-1242.
Echigo, T., Kimata, M. (2010) Crystal chemistry and genesis of organic minerals: A review of oxalate and polycyclic aromatic hydrocarbon minerals. The Canadian Mineralogist: 48: 1329-1358.

Internet Links for WheatleyiteHide

Localities for WheatleyiteHide

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.
USA
 
  • Pennsylvania
    • Chester Co.
      • Schuylkill Township
MinRec 20:369-386
Rouse, et al (1986); Am.Min.: 71 (1986): 1240; Acta Cryst.: B36 (1980): 2145.
Mineral and/or Locality  
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