Natroxalate
A valid IMA mineral species
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About Natroxalate
Formula:
Na2(C2O4)
Colour:
Light yellow color with a pink or greenish tint, creamy in fine-grained aggregates
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
2.32
Crystal System:
Monoclinic
Name:
Named in 1996 by Alexander Petrovich Khomyakov after its chemical composition of sodium (latin, natrium) and oxalate
This page provides mineralogical data about Natroxalate.
Unique Identifiers
Mindat ID:
7187
Long-form identifier:
mindat:1:1:7187:7
GUID
(UUID V4):
(UUID V4):
e39f2638-46c5-4087-9fc6-876bd6856368
IMA Classification of Natroxalate
Approved
First published:
1996
Classification of Natroxalate
10.AB.60
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : Oxalates
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : 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 |
---|---|---|
Nx | 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 Natroxalate
Vitreous
Transparency:
Transparent
Colour:
Light yellow color with a pink or greenish tint, creamy in fine-grained aggregates
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
perfect {100} and distinct {001} and {221} cleavages
perfect {100} and distinct {001} and {221} cleavages
Fracture:
Step-Like
Density:
2.32(3) g/cm3 (Measured) 2.338 g/cm3 (Calculated)
Optical Data of Natroxalate
Type:
Biaxial (-)
RI values:
nα = 1.415(2) nβ = 1.524(2) nγ = 1.592(2)
2V:
Measured: 72° (1), Calculated: 72°
Max Birefringence:
δ = 0.177
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:
Low
Dispersion:
relatively strong, r > v
Comments:
b = Z, c ∧ X = 20deg in obtuse angle b, optic axial plane normal to (010).
Chemistry of Natroxalate
Mindat Formula:
Na2(C2O4)
Elements listed:
Crystallography of Natroxalate
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/a
Cell Parameters:
a = 10.426(9) Å, b = 5.255(5) Å, c = 3.479(3) Å
β = 92.14(8)°
β = 92.14(8)°
Ratio:
a:b:c = 1.984 : 1 : 0.662
Unit Cell V:
190.48 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Prismatic, elongate [001], showing {110}, {001}, {010}, {100}, and {221}
Twinning:
Some crystals are twinned on (110).
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0009741 | Natroxalate | Reed D A, Olmstead M M (1981) Sodium oxalate structure refinement Acta Crystallographica B37 938-939 | 1981 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.826 Å | (100) |
2.602 Å | (56) |
2.334 Å | (33) |
2.898 Å | (27) |
2.041 Å | (14) |
5.203 Å | (13) |
2.117 Å | (13) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
22 : Hydration and low-? subsurface aqueous alteration (see also #23) | |
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
52 : Guano- and urine-derived minerals | <0.4 |
Type Occurrence of Natroxalate
General Appearance of Type Material:
Granular nodules to 1–2 cm, as veinlet-like segregations, as columnar crystals 3–5 mm long and up to 1 mm thick, and as radiating aggregates of the crystals.
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Moscow, Russia.
Geological Setting of Type Material:
Hydrothermal phase in ultra-agpaitic pegmatites and hydrothermalites.
Associated Minerals at Type Locality:
Reference:
Khomyakov, A.P. (1996) Natroxalate Na2C2O4 – a new mineral. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva: 125(1): 126-132.
Synonyms of Natroxalate
Other Language Names for Natroxalate
German:Natro-Oxalat
Common Associates
Associated Minerals Based on Photo Data:
5 photos of Natroxalate associated with Salammoniac | NH4Cl |
3 photos of Natroxalate associated with Möhnite | (NH4)K2Na(SO4)2 |
3 photos of Natroxalate associated with Nitratine | NaNO3 |
2 photos of Natroxalate associated with Triazolite | NaCu2(N3C2H2)2(NH3)2Cl3 · 4H2O |
2 photos of Natroxalate associated with Chanabayaite | CuCl(N3C2H2)(NH3) · 0.25H2O |
2 photos of Natroxalate associated with Joanneumite | Cu(C3N3O3H2)2(NH3)2 |
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.20 | Stepanovite | NaMgFe3+(C2O4)3 · 8-9H2O |
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 | 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
IR Spectrum:
Strong absorption bands at 520, 775, 1320, 1340, and 1640 cm-1, characteristic of oxalates.
Thermal Behaviour:
Exothermic effect at 550 degC (24.1 wt% loss versus 20.1 wt% calculated) corresponding to oxidation to form sodium carbonate
and CO2; an endothermic peak at 880 degC represents melting
and partial vaporization of the sodium carbonate.
and CO2; an endothermic peak at 880 degC represents melting
and partial vaporization of the sodium carbonate.
Notes:
Readily soluble in weak acids and in water.
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 Natroxalate
mindat.org URL:
https://www.mindat.org/min-7187.html
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References for Natroxalate
Reference List:
Localities for Natroxalate
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - 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.
Chile | |
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Russia | |
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Kukisvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia