Uroxite
A valid IMA mineral species
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About Uroxite
Formula:
[(UO2)2(C2O4)(OH)2(H2O)2] · H2O
Colour:
light yellow
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
4.187 (Calculated)
Crystal System:
Monoclinic
Name:
Named for its composition uranyl (UR) oxalate (OX).
Unique Identifiers
Mindat ID:
53223
Long-form identifier:
mindat:1:1:53223:1
GUID
(UUID V4):
(UUID V4):
4a24a1b8-b719-4eee-a638-d2d40830fc33
IMA Classification of Uroxite
Approved
IMA Formula:
[(UO2)2(C2O4)(OH)2(H2O)2] · H2O
Approval year:
2018
First published:
2020
Classification of Uroxite
10.AB.
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 |
---|---|---|
Urx | 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 Uroxite
Vitreous
Transparency:
Transparent
Colour:
light yellow
Streak:
very pale yellow
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
perfect on {102}, fair on {001}
perfect on {102}, fair on {001}
Fracture:
Irregular/Uneven
Density:
4.187 g/cm3 (Calculated)
Comment:
dissolves in clerici solution
Optical Data of Uroxite
Type:
Biaxial (-)
RI values:
nα = 1.602(2) nβ = 1.660(2) nγ = 1.680(2)
2V:
Measured: 59° (1), Calculated: 59.1°
Max Birefringence:
δ = 0.078
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:
Moderate
Dispersion:
r > v, moderate
Pleochroism:
Non-pleochroic
Comments:
Y = b, Z ^ a = 35° in obtuse β
Chemistry of Uroxite
Mindat Formula:
[(UO2)2(C2O4)(OH)2(H2O)2] · H2O
Elements listed:
Crystallography of Uroxite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 5.5698(2) Å, b = 15.2877(6) Å, c = 13.3724(9) Å
β = 94.015(7)°
β = 94.015(7)°
Ratio:
a:b:c = 0.364 : 1 : 0.875
Unit Cell V:
1135.86 ų
Z:
4
Morphology:
As prisms or blades, elongate and striated on [100], more or less flattened on {010} and with steeply sloping terminations. Prism forms {010} and {001} terminated by {102}
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
10.05 Å | (38) |
5.00 Å | (100) |
4.75 Å | (23) |
4.43 Å | (51) |
3.567 Å | (33) |
3.341 Å | (29) |
3.271 Å | (20) |
2.623 Å | (28) |
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 Uroxite
Co-Type Localities:
General Appearance of Type Material:
Crystals occur as striated prisms or blades, up to about 1 mm long, with square to rectangular cross-sections and steeply sloping terminations. Crystals typically occur in radiating sprays.
Place of Conservation of Type Material:
Cotype material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 73514 and 73515 (Burro mine), 73516 and 73517 (Markey mine).
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 Uroxite
Common Associates
Related Minerals - Strunz-mindat Grouping
10.AB. | Deveroite-(Ce) | Ce2(C2O4)3 · 10H2O |
10.AB.X | Falottaite | MnC2O4 · 3H2O |
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 | 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 Uroxite
moderate neon-green fluorescence
Other Information
Notes:
At room-temperature, 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 Uroxite
mindat.org URL:
https://www.mindat.org/min-53223.html
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References for Uroxite
Reference List:
Localities for Uroxite
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.
USA (TL) | |
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Burro Mine, Slick Rock Mining District, San Miguel County, Colorado, USA