Metauroxite
A valid IMA mineral species
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About Metauroxite
Formula:
(UO2)2(C2O4)(OH)2(H2O)2
Colour:
Light yellow
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
4.403 (Calculated)
Crystal System:
Triclinic
Name:
Named for being lower hydrate counterpart of uroxite.
The lower hydrate counterpart of uroxite. Second natural uranium (uranyl) oxalate. Known synthetic analogue. Structure determined.
Unique Identifiers
Mindat ID:
53690
Long-form identifier:
mindat:1:1:53690:9
GUID
(UUID V4):
(UUID V4):
014de556-2726-4fd6-9297-b923d0209165
IMA Classification of Metauroxite
Approved
Approval year:
2019
First published:
2020
Classification of Metauroxite
10.AB.52
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 |
|---|---|---|
| Murx | 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 Metauroxite
Vitreous
Colour:
Light yellow
Streak:
Very pale yellow
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Two good cleavages probably on {101} and {010} based on the structure.
Two good cleavages probably on {101} and {010} based on the structure.
Fracture:
Irregular/Uneven
Density:
4.403 g/cm3 (Calculated)
Chemistry of Metauroxite
Mindat Formula:
(UO2)2(C2O4)(OH)2(H2O)2
Elements listed:
Crystallography of Metauroxite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.5635(3) Å, b = 6.1152(4) Å, c = 7.8283(4) Å
α = 85.572(5)°, β = 89.340(4)°, γ = 82.468(5)°
α = 85.572(5)°, β = 89.340(4)°, γ = 82.468(5)°
Ratio:
a:b:c = 0.91 : 1 : 1.28
Unit Cell V:
263.25 ų
Z:
1
Morphology:
Crude blades and lozenge-shaped tablets; commonly in irregular and bowtie-like intergrowths. Tablets are apparently flattened on {011}.
Twinning:
Twinning is ubiquitous, by 180° rotation around the perpendicular to {011}. Polysynthetic.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.06 Å | (45) |
| 5.52 Å | (33) |
| 4.97 Å | (34) |
| 4.52 Å | (100) |
| 3.888 Å | (80) |
| 3.748 Å | (22) |
| 3.180 Å | (51) |
| 2.604 Å | (32) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 53 : Other minerals with taphonomic origins | <0.4 |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Metauroxite
General Appearance of Type Material:
Light yellow crude blades and tablets
Place of Conservation of Type Material:
Mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 67289 and 67290 (cotypes).
Geological Setting of Type Material:
Post-mining secondary phases found in efflorescent crusts on mine walls.
Associated Minerals at Type Locality:
Reference:
Kampf, A.R., Plášil, J., Nash, B.P., Němec, I., Marty, J. (2020) Uroxite and metauroxite, the first two uranyl oxalate minerals. Mineralogical Magazine: 84(1): 131-141.
Synonyms of Metauroxite
Common Associates
Associated Minerals Based on Photo Data:
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.55 | Oxammite | (NH4)2(C2O4) · H2O |
| 10.AB.60 | Natroxalate | Na2(C2O4) |
| 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 |
Fluorescence of Metauroxite
Weak green-gray fluorescence under 405 nm laser illumination
Other Information
Notes:
Insoluble in H2O and slowly soluble in dilute HCl
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 Metauroxite
mindat.org URL:
https://www.mindat.org/min-53690.html
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References for Metauroxite
Reference List:
Localities for Metauroxite
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
USA (TL) | |
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Burro Mine, Slick Rock Mining District, San Miguel County, Colorado, USA