Metauranocircite
A valid IMA mineral species - grandfathered
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About Metauranocircite
Formula:
Ba(UO2)2(PO4)2 · 7H2O
Colour:
Greenish yellow, yellowish green
Lustre:
Resinous, Waxy, Greasy, Pearly
Hardness:
2 - 2½
Specific Gravity:
3.94
Crystal System:
Monoclinic
Member of:
Name:
Named meta-uranocircite in 1904 by Paul Gaubert for its dehydrated relationship to uranocircite, where 'meta-' indicated the dehydration as earlier done with meta-autunite. Renamed to meta-uranocircite-I by Walenta (1963). The first hyphen was removed in a 2008 renaming (Burke 2008). The suffix was dropped in 2022, giving metauranocircite.
Type Locality:
Isostructural with:
Meta-autunite Group.
Rapid dehydration of uranocircite in dry atmospheres at normal temperature results in metauranocircite (metauranocircite-I of Walenta, 1963).
Metauranocircite may be more common than realized because of its similar appearance to meta-autunite and other species.
Rapid dehydration of uranocircite in dry atmospheres at normal temperature results in metauranocircite (metauranocircite-I of Walenta, 1963).
Metauranocircite may be more common than realized because of its similar appearance to meta-autunite and other species.
Unique Identifiers
Mindat ID:
2665
Long-form identifier:
mindat:1:1:2665:5
GUID
(UUID V4):
(UUID V4):
1d0ccd06-31ae-43ce-8f3d-9ddb7e255611
IMA Classification of Metauranocircite
Approved, 'Grandfathered' (first described prior to 1959)
IMA status notes:
Renamed by the IMA
IMA Formula:
Ba(UO2)2(PO4)2 · 6H2O
First published:
1904
Classification of Metauranocircite
8.EB.10
8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
B : UO2:RO4 = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
B : UO2:RO4 = 1:1
40.2a.3.2
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2a : AB2(XO4)2·xH2O, containing (UO2)2+
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2a : AB2(XO4)2·xH2O, containing (UO2)2+
19.11.21
19 : Phosphates
11 : Phosphates of U
19 : Phosphates
11 : Phosphates of U
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 |
|---|---|---|
| Murc-I | 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 Metauranocircite
Resinous, Waxy, Greasy, Pearly
Transparency:
Transparent, Translucent
Colour:
Greenish yellow, yellowish green
Streak:
Yellowish white
Hardness:
2 - 2½ on Mohs scale
Tenacity:
Very brittle
Cleavage:
Perfect
{001}
{001}
Density:
3.94 g/cm3 (Measured) 3.95 g/cm3 (Calculated)
Optical Data of Metauranocircite
Type:
Biaxial (-)
RI values:
nα = 1.610 nβ = 1.621 - 1.623 nγ = 1.622 - 1.623
Birefringence:
0.002
Max Birefringence:
δ = 0.012 - 0.013
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:
relatively strong
Optical Extinction:
X = c
Pleochroism:
Weak
Comments:
X = colorless
Y = Z = Pale canary yellow
Y = Z = Pale canary yellow
Chemistry of Metauranocircite
Mindat Formula:
Ba(UO2)2(PO4)2 · 7H2O
Crystallography of Metauranocircite
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Cell Parameters:
a = 6.943(2) Å, b = 17.634(6) Å, c = 6.952(2) Å
β = 90.023(7)°
β = 90.023(7)°
Ratio:
a:b:c = 0.394 : 1 : 0.394
Unit Cell V:
851.2 ų
Z:
2
Morphology:
Platy square crystals, also earthy.
Comment:
Pseudotetragonal metrics; twinned. Data for synthetic material.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.82 Å | (100) |
| 5.46 Å | (15) |
| 4.410 Å | (55) |
| 3.723 Å | (50) |
| 2.708 Å | (20) |
| 2.205 Å | (18) |
| 1.4621 Å | (18) |
Comments:
ICDD 36-407
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 21 : Chemically precipitated carbonate, phosphate, iron formations | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47f : [Uranyl (U⁶⁺) minerals] |
Geological Setting:
Sedimentary uranium deposits, granite pegmatites
Type Occurrence of Metauranocircite
Place of Conservation of Type Material:
State Museum for Mineralogy and Geology, Dresden, Germany.
Mining Academy, Freiberg, Germany.
Mining Academy, Freiberg, Germany.
Reference:
Gaubert, P. (1904) Produits deshydration de quelque phosphates et orientation du chlorure de baryum sur les mineraux des groups de l'autunite. Bulletin de la Société Française de Minéralogie: 27: 212-216.
Synonyms of Metauranocircite
Other Language Names for Metauranocircite
Relationship of Metauranocircite to other Species
Member of:
Other Members of this group:
| Abernathyite | K(UO2)(AsO4) · 3H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc |
| Chernikovite | (H3O)2(UO2)2(PO4)2 · 6H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm |
| Lehnerite | Mn2+(UO2)2(PO4)2 · 8H2O | Mon. 2/m |
| Meta-ankoleite | K2(UO2)2(PO4)2 · 6H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm |
| Meta-autunite | Ca(UO2)2(PO4)2 · 6H2O | Tet. 4/mmm (4/m 2/m 2/m) |
| Metaheinrichite | Ba(UO2)2(AsO4)2 · 8H2O | Mon. 2 : P21 |
| Metakahlerite | Fe2+(UO2)2(AsO4)2 · 8H2O | Tric. 1 : P1 |
| Metakirchheimerite | Co(UO2)2(AsO4)2 · 8H2O | Tric. 1 : P1 |
| Metalodèvite | Zn(UO2)2(AsO4)2 · 10H2O | Tet. 4/m : P42/m |
| Metanatroautunite | Na(UO2)(PO4)(H2O)3 | Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc |
| Metanováčekite | Mg(UO2)2(AsO4)2 · 8H2O | Tet. 4/m : P4/n |
| Metarauchite | Ni(UO2)2(AsO4)2 · 8H2O | Tric. 1 : P1 |
| Metasaléeite | Mg(UO2)2(PO4)2 · 8H2O | |
| Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O | Tet. 4/m : P4/n |
| Metauranospinite | Ca(UO2)2(AsO4)2 · 8H2O | Tet. 4/m : P42/n |
| Metazeunerite | Cu(UO2)2(AsO4)2 · 8H2O | Tet. 4/m : P42/n |
| Natrouranospinite | Na2(UO2)2(AsO4)2 · 5H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm |
| Trögerite | (H3O)(UO2)(AsO4) · 3H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm |
| Uramarsite | (NH4)(UO2)(AsO4) · 3H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/mmm |
| Uramphite | (NH4)2(UO2)2(PO4)2 · 6H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc |
Common Associates
Associated Minerals Based on Photo Data:
| 6 photos of Metauranocircite associated with Tridymite | SiO2 |
| 5 photos of Metauranocircite associated with Uranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
| 3 photos of Metauranocircite associated with Thomsenolite | NaCa[AlF6] · H2O |
| 3 photos of Metauranocircite associated with Rhyolite | |
| 2 photos of Metauranocircite associated with Smoky Quartz | SiO2 |
| 2 photos of Metauranocircite associated with Sklodowskite | Mg(UO2)2(SiO3OH)2 · 6H2O |
| 1 photo of Metauranocircite associated with Phosphuranylite | KCa(H3O)3(UO2)7(PO4)4O4 · 8H2O |
| 1 photo of Metauranocircite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
| 1 photo of Metauranocircite associated with Uraninite | UO2 |
| 1 photo of Metauranocircite associated with Fluorite | CaF2 |
Related Minerals - Strunz-mindat Grouping
| 8.EB. | Meta-autunite Group | A1-2(UO2)2(TO4)2 · 5-10H2O |
| 8.EB.05 | Autunite | Ca(UO2)2(PO4)2 · 10-12H2O |
| 8.EB.05 | Heinrichite | Ba(UO2)2(AsO4)2 · 10H2O |
| 8.EB.05 | Kahlerite | Fe(UO2)2(AsO4)2 · 12H2O |
| 8.EB.05 | Hydronováčekite | Mg(UO2)2(AsO4)2 · 12H2O |
| 8.EB.05 | Saléeite | Mg(UO2)2(PO4)2 · 10H2O |
| 8.EB.05 | Torbernite | Cu(UO2)2(PO4)2 · 12H2O |
| 8.EB.05 | Uranocircite | Ba(UO2)2(PO4)2 · 10H2O |
| 8.EB.05 | Uranospinite | Ca(UO2)2(AsO4)2 · 10H2O |
| 8.EB.05 | Xiangjiangite | (Fe3+,Al)(UO2)4(PO4)2(SO4)2(OH) · 22H2O |
| 8.EB.05 | Zeunerite | Cu(UO2)2(AsO4)2 · 12H2O |
| 8.EB.05 | Metarauchite | Ni(UO2)2(AsO4)2 · 8H2O |
| 8.EB.05 | Nováčekite | Mg(UO2)2(AsO4)2 · 10H2O |
| 8.EB.05 | Rauchite | Ni(UO2)2(AsO4)2 · 10H2O |
| 8.EB.10 | Bassetite | Fe2+(UO2)2(PO4)2 · 10H2O |
| 8.EB.10 | Lehnerite | Mn2+(UO2)2(PO4)2 · 8H2O |
| 8.EB.10 | Meta-autunite | Ca(UO2)2(PO4)2 · 6H2O |
| 8.EB.10 | Metasaléeite | Mg(UO2)2(PO4)2 · 8H2O |
| 8.EB.10 | Metauranospinite | Ca(UO2)2(AsO4)2 · 8H2O |
| 8.EB.10 | Metaheinrichite | Ba(UO2)2(AsO4)2 · 8H2O |
| 8.EB.10 | Metakahlerite | Fe2+(UO2)2(AsO4)2 · 8H2O |
| 8.EB.10 | Metakirchheimerite | Co(UO2)2(AsO4)2 · 8H2O |
| 8.EB.10 | Metanováčekite | Mg(UO2)2(AsO4)2 · 8H2O |
| 8.EB.10 | Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O |
| 8.EB.10 | Metazeunerite | Cu(UO2)2(AsO4)2 · 8H2O |
| 8.EB.10 | Przhevalskite | Pb2(UO2)3(PO4)2(OH)4 · 3H2O |
| 8.EB.10 | Pseudo-autunite | (H3O)4Ca2(UO2)2(PO4)4 · 5H2O |
| 8.EB.10 | Metanatroautunite | Na(UO2)(PO4)(H2O)3 |
| 8.EB.15 | Abernathyite | K(UO2)(AsO4) · 3H2O |
| 8.EB.15 | Chernikovite | (H3O)2(UO2)2(PO4)2 · 6H2O |
| 8.EB.15 | Meta-ankoleite | K2(UO2)2(PO4)2 · 6H2O |
| 8.EB.15 | Natrouranospinite | Na2(UO2)2(AsO4)2 · 5H2O |
| 8.EB.15 | Trögerite | (H3O)(UO2)(AsO4) · 3H2O |
| 8.EB.15 | Uramphite | (NH4)2(UO2)2(PO4)2 · 6H2O |
| 8.EB.15 | Uramarsite | (NH4)(UO2)(AsO4) · 3H2O |
| 8.EB.20 | Threadgoldite | Al(UO2)2(PO4)2(OH) · 8H2O |
| 8.EB.20 | Chistyakovaite | Al(UO2)2(AsO4)2(F,OH) · 6.5H2O |
| 8.EB.25 | Arsenuranospathite | Al(UO2)2(AsO4)2F · 20H2O |
| 8.EB.25 | Uranospathite | (Al,◻)(UO2)2(PO4)2F · 20(H2O,F) |
| 8.EB.30 | Vochtenite | (Fe2+,Mg)Fe3+(UO2)4(PO4)4(OH) · 12-13H2O |
| 8.EB.35 | Coconinoite | Fe3+2Al2(UO2)2(PO4)4(SO4)(OH)2 · 20H2O |
| 8.EB.40 | Ranunculite | HAl(UO2)(PO4)(OH)3 · 4H2O |
| 8.EB.45 | Triangulite | Al3(UO2)4(PO4)4(OH)5 · 5H2O |
| 8.EB.50 | Furongite | Al13(UO2)7(PO4)13(OH)14 · 58H2O |
| 8.EB.55 | Sabugalite | HAl(UO2)4(PO4)4 · 16H2O |
| 8.EB.60 | Horákite | (Bi7O7OH)[(UO2)4(PO4)2(AsO4)2(OH)2] · 3.5H2O |
Fluorescence of Metauranocircite
Very fluorescent yellow-green in SW and LW UV.
Other Information
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 Metauranocircite
mindat.org URL:
https://www.mindat.org/min-2665.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Metauranocircite
Reference List:
Nuffield, E. W., Milne, I. H. (1953) Studies of radioactive compounds: VI - Meta-uranocircite. American Mineralogist, 38 (5-6) 476-488
Pulou, Raymond (1957) Méta-uranocircite d'Entraygues (Aveyron) Bulletin de Minéralogie, 80 (1) 32-38 doi:10.3406/bulmi.1957.5132
(1958) Systematic mineralogy of uranium and thorium. Bulletin Vol. 1064. US Geological Survey doi:10.3133/b1064 pp.211-215
Khosrawan-Sazedj, Fereshteh (1982) The crystal structure of meta-uranocircite II, Ba(UO2)2(PO4)2·6H2O. TMPM Tschermaks Mineralogische und Petrographische Mitteilungen, 29 (3) 193-204 doi:10.1007/bf01084642
Vochten, R. F., Van Haverbeke, L., Van Springel, K. (1992) Transformation of chernikovite into meta-uranocircite II, Ba(UO2)2(PO4)2.6H2O and study of its solubility. Mineralogical Magazine, 56 (384) 367-372 doi:10.1180/minmag.1992.056.384.09
Burns, Peter C. (2005) U6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. The Canadian Mineralogist, 43 (6) 1839-1894 doi:10.2113/gscanmin.43.6.1839
Locock, A. J., Burns, P. C., Flynn, T. M. (2005) Structures of strontium- and barium-dominant compounds that contain the autunite-type sheet. The Canadian Mineralogist, 43 (2) 721-733 doi:10.2113/gscanmin.43.2.721 (synthetic meta-uranocircite I)
Burke, Ernst A. J. (2008) Tidying up mineral names: an IMA-CNMNC scheme for suffixes, hyphens and diacritical marks. The Mineralogical Record, 39 (2) 131-135
Localities for Metauranocircite
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.
Austria | |
| Brandstätter et al. (1990) +1 other reference |
| Aufschluss 1972 (SB) +1 other reference |
| Exel (1993) |
Brazil | |
| Atencio et al. (2004) |
| D Atencio & R Hypolito () |
| Fosfatos e Silicatos Secundários de ... | |
Canada | |
| Chatterjee (1977) |
Czech Republic | |
| Pauliš P. et al. (Kutna Hora, issue 1) |
| Jirásek J. et al. (2016) |
| Pauliš P. et al. (Kutna Hora, issue 1) |
| Pauliš P. et al. (Kutna Hora, issue 1) |
| Pauliš P. et al. (Kutna Hora, issue 1) |
| Uranové minerály České republiky a ... |
France | |
| |
| Lièvre et al. (2002) |
| Lièvre et al. (2002) |
| Lièvre et al. (2002) |
| J. Geffroy |
Gabon | |
| Lheur et al. (2001) +1 other reference |
Germany | |
| Walenta (1992) |
| Walenta (1992) |
| Walenta (1992) | |
| see locality page |
| Dill et al. (2010) |
| Lapis 30 (7/8) |
| Schnorrer-Köhler (1991) +1 other reference |
Niger | |
| www.cnncintl.com (2015) |
Poland | |
| Mochnacka et al. (2000) +2 other references |
| Syczewski et al. (2023) +1 other reference | |
| Lis et al. (1986) | |
| Syczewski et al. (2023) |
| Mochnacka et al. (2000) |
| Rewerski et al. (2014) +2 other references | |
Portugal | |
| LNEG info +1 other reference |
USA | |
| Holland et al. (1958) +3 other references |
| Granger (1955) +1 other reference | |
| Eckel et al. (1997) |
| Am Min (1957) |
| Jensen (2012) |
| |
| Roberts et al. (1965) |
| Mineralogical Society of America - ... |
| Tom Loomis website | |
| Mineralogical Society of America - ... | |
| Smith et al. (2000) |
| Bullock (1981) |
| Luetcke (n.d.) | |
| Jerden (2001) |
| rruff.geo.arizona.edu (n.d.) |
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Krunkelbach Valley Uranium deposit, Menzenschwand, St Blasien, Waldshut, Freiburg Region, Baden-Württemberg, Germany