Metakahlerite
A valid IMA mineral species - grandfathered
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About Metakahlerite
Formula:
Fe2+(UO2)2(AsO4)2 · 8H2O
Colour:
sulphur yellow
Hardness:
2 - 3
Crystal System:
Triclinic
Member of:
Name:
The prefix 'meta' indicates a lower hydration level of kahlerite.
Unique Identifiers
Mindat ID:
2676
Long-form identifier:
mindat:1:1:2676:1
GUID
(UUID V4):
(UUID V4):
56fc4919-2dba-4ceb-857f-61c78dcc5298
IMA Classification of Metakahlerite
Approved, 'Grandfathered' (first described prior to 1959)
Classification of Metakahlerite
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.15.2
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+
20.7.18
20 : Arsenates (also arsenates with phosphate, but without other anions)
7 : Arsenates of U
20 : Arsenates (also arsenates with phosphate, but without other anions)
7 : Arsenates 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 |
|---|---|---|
| Mkah | 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 Metakahlerite
Optical Data of Metakahlerite
Type:
Uniaxial (-)
RI values:
nω = 1.642 nε = 1.608
Max Birefringence:
δ = 0.034
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
Chemistry of Metakahlerite
Mindat Formula:
Fe2+(UO2)2(AsO4)2 · 8H2O
Crystallography of Metakahlerite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.2072 Å, b = 9.8242 Å, c = 13.2708 Å
α = 75.37°, β = 84.024°, γ = 81.839°
α = 75.37°, β = 84.024°, γ = 81.839°
Ratio:
a:b:c = 0.734 : 1 : 1.351
Unit Cell V:
897.68 ų (Calculated from Unit Cell)
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) |
|---|---|---|---|---|---|---|---|
| 0005992 | Metakahlerite | Locock A J, Burns P C, Flynn M (2004) Divalent transition metals and magnesium in structures that contain the autunite-type sheet The Canadian Mineralogist 42 1699-1718 |  | 2004 | 0 | 293 |
CIF Raw Data - click here to close
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] |
Type Occurrence of Metakahlerite
Other Language Names for Metakahlerite
German:Metakahlerit
Spanish:Metakahlerita
Relationship of Metakahlerite 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 |
| 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 |
| Metauranocircite | Ba(UO2)2(PO4)2 · 7H2O | Mon. 2 : P21 |
| 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
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 | Metauranocircite | Ba(UO2)2(PO4)2 · 7H2O |
| 8.EB.10 | Metauranospinite | Ca(UO2)2(AsO4)2 · 8H2O |
| 8.EB.10 | Metaheinrichite | Ba(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 |
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 Metakahlerite
mindat.org URL:
https://www.mindat.org/min-2676.html
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References for Metakahlerite
Reference List:
Vochten, R., De Grave, E., Pelsmaekers, J. (1986) Synthesis, crystallographic and spectroscopic data, solubility, and electrokinetic properties of metakahlerite and its Mn analogue. American Mineralogist, 71 (7-8) 1037-1044
Localities for Metakahlerite
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 | |
| |
France | |
| Collection Frédéric Bonnet |
Germany | |
| Walenta (1992) |
| 54 (in German) +1 other reference |
| Fleischer (1960) +3 other references |
| |
| Walenta (1992) |
| Walenta (1992) |
| Walenta (1992) |
| Aufschluss 69/ (7+8) +1 other reference |
| Meisl (1985) |
| Möhn |
Namibia | |
| Jahn et al. (2006) |
South Africa | |
| Cairncross et al. (1995) |
Switzerland | |
| Krzemnicki (1992) |
| Stalder et al. (1998) +1 other reference |
UK | |
| Braithwaite et al. (1990) |
| Day (1999) | |
| Seward (1975) +1 other reference | |
| R. S. W. Braithwaite and J. R. Knight (1990) +1 other reference |
USA | |
| Kampf et al. (2018) |
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Mas d'Alary opencast mine, Lodève, Lodève, Hérault, Occitanie, France