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Metakahlerite

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Menzenschwand, Black Forest, Baden-Württemberg, Germany
© Knut Eldjarn




Formula:
Fe
2+
 
(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O
System:TriclinicColour:sulphur yellow
Hardness:2 - 3
Member of:Meta-autunite Group


Meta-autunite Group.

Classification of Metakahlerite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/E.02-30
Nickel-Strunz 10th (pending) edition ID:8.EB.10

8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
B : UO2:RO4 = 1:1
Dana 8th edition ID:40.2a.15.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2a : AB2(XO4)2·xH2O, containing (UO2)2+
Hey's CIM Ref.:20.7.18

20 : Arsenates (also arsenates with phosphate, but without other anions)
7 : Arsenates of U
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Type Occurrence of Metakahlerite

Type Locality:Sophia Mine, Böckelsbach valley, Wittichen, Schenkenzell, Black Forest, Baden-Württemberg, Germany
Year of Discovery:1958

Physical Properties of Metakahlerite

Colour:sulphur yellow
Streak:pale yellow
Hardness (Mohs):2 - 3
Cleavage:Perfect

Crystallography of Metakahlerite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 7.2072Å, b = 9.8242Å, c = 13.2708Å
α = 75.37°, β = 84.024°, γ = 81.839°
Ratio:a:b:c = 0.734 : 1 : 1.351
Unit Cell Volume:V 897.68 ų (Calculated from Unit Cell)

Optical Data of Metakahlerite

Type:Uniaxial (-)
RI values: nω = 1.642 nε = 1.608
Maximum Birefringence:δ = 0.034

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Metakahlerite

Formula:
Fe
2+
 
(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O
Essential elements:As, Fe, H, O, U
All elements listed in formula:As, Fe, H, O, U

Relationship of Metakahlerite to other Species

Member of:Meta-autunite Group
Other Members of Group:

- +
Abernathyite
K
 
2
(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 6H
 
2
O
Bassetite
Fe
2+
 
(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 8H
 
2
O
Chernikovite
(H
 
3
O)
 
2
(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 6H
 
2
O
Lehnerite
Mn
2+
 
(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 8H
 
2
O
Meta-ankoleite
K
 
2
(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 6H
 
2
O
Meta-autunite
Ca(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 6-8H
 
2
O
Metaheinrichite
Ba(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O
Metakirchheimerite
Co(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O
Metalodèvite
Zn(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 10H
 
2
O
Metanováčekite
Mg(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 4-8H
 
2
O
Metatorbernite
Cu(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 8H
 
2
O
Metauranocircite
Ba(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 7H
 
2
O
Metauranospinite
Ca(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O
Metazeunerite
Cu(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O
Natrouranospinite
(Na
 
2
,Ca)(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 5H
 
2
O
Uramarsite
(NH
 
4
,H
 
3
O)
 
2
(UO
 
2
)
 
2
(AsO
 
4
,PO
 
4
)
 
2
 · 6H
 
2
O
Uramphite
(NH
 
4
)
 
2
(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 6H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
8.EB.05Autunite
Ca(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 11H
 
2
O
8.EB.05Heinrichite
Ba(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 10H
 
2
O
8.EB.05Kahlerite
Fe(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 12H
 
2
O
8.EB.05Nováčekite-I
Mg(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 12H
 
2
O
8.EB.05Saléeite
Mg(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 10H
 
2
O
8.EB.05Torbernite
Cu(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 12H
 
2
O
8.EB.05Uranocircite
Ba(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 10H
 
2
O
8.EB.05Uranospinite
Ca(UO
 
2
)(AsO
 
4
)
 
2
 · 10H
 
2
O
8.EB.05Xiangjiangite
(Fe
3+
 
,Al)(UO
 
2
)
 
4
(PO
 
4
)
 
2
(SO
 
4
)
 
2
(OH) · 22H
 
2
O
8.EB.05Zeunerite
Cu(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 12H
 
2
O
8.EB.05Metarauchite
Ni(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O
8.EB.10Bassetite
Fe
2+
 
(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 8H
 
2
O
8.EB.10Lehnerite
Mn
2+
 
(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 8H
 
2
O
8.EB.10Meta-autunite
Ca(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 6-8H
 
2
O
8.EB.10Metasaléeite
Mg(UO
 
2
)(PO
 
4
)
 
2
 · 8H
 
2
O
8.EB.10Metauranocircite
Ba(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 7H
 
2
O
8.EB.10Metauranospinite
Ca(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O
8.EB.10Metaheinrichite
Ba(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O
8.EB.10Metakirchheimerite
Co(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O
8.EB.10Metanováčekite
Mg(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 4-8H
 
2
O
8.EB.10Metatorbernite
Cu(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 8H
 
2
O
8.EB.10Metazeunerite
Cu(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O
8.EB.10Przhevalskite
Pb
 
2
(UO
 
2
)
 
3
(PO
 
4
)
 
2
(OH)
 
4
 · 3H
 
2
O
8.EB.10Meta-lodèvite
8.EB.15Abernathyite
K
 
2
(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 6H
 
2
O
8.EB.15Chernikovite
(H
 
3
O)
 
2
(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 6H
 
2
O
8.EB.15Meta-ankoleite
K
 
2
(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 6H
 
2
O
8.EB.15Natrouranospinite
(Na
 
2
,Ca)(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 5H
 
2
O
8.EB.15Trögerite
(UO
 
2
)
 
3
(AsO
 
4
)
 
2
 · 12H
 
2
O (?)
8.EB.15Uramphite
(NH
 
4
)
 
2
(UO
 
2
)
 
2
(PO
 
4
)
 
2
 · 6H
 
2
O
8.EB.15Uramarsite
(NH
 
4
,H
 
3
O)
 
2
(UO
 
2
)
 
2
(AsO
 
4
,PO
 
4
)
 
2
 · 6H
 
2
O
8.EB.20Threadgoldite
Al(UO
 
2
)
 
2
(PO
 
4
)
 
2
(OH) · 8H
 
2
O
8.EB.20Chistyakovaite
Al(UO
 
2
)
 
2
(AsO
 
4
)
 
2
(F,OH) · 6.5H
 
2
O
8.EB.25Arsenuranospathite
HAl(UO
 
2
)
 
4
(AsO
 
4
)
 
4
 · 40H
 
2
O
8.EB.25Uranospathite
(Al,☐)(UO
 
2
)
 
2
(PO
 
4
)
 
2
F · 20(H
 
2
O,F)
8.EB.30Vochtenite
(Fe
2+
 
,Mg)Fe
3+
 
(UO
 
2
)
 
4
(PO
 
4
)
 
4
(OH) · 12-13H
 
2
O
8.EB.35Coconinoite
Fe
3+
2
Al
 
2
(UO
 
2
)
 
2
(PO
 
4
)
 
4
(SO
 
4
)(OH)
 
2
 · 20H
 
2
O
8.EB.40Ranunculite
HAl(UO
 
2
)(PO
 
4
)(OH)
 
3
 · 4H
 
2
O
8.EB.45Triangulite
Al
 
3
(UO
 
2
)
 
4
(PO
 
4
)
 
4
(OH)
 
5
 · 5H
 
2
O
8.EB.50Furongite
Al
 
13
(UO
 
2
)
 
7
(PO
 
4
)
 
13
(OH)
 
14
 · 58H
 
2
O
8.EB.55Sabugalite
HAl(UO
 
2
)
 
4
(PO
 
4
)
 
4
 · 16H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
20.7.1Trögerite
(UO
 
2
)
 
3
(AsO
 
4
)
 
2
 · 12H
 
2
O (?)
20.7.2Natrouranospinite
(Na
 
2
,Ca)(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 5H
 
2
O
20.7.3Abernathyite
K
 
2
(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 6H
 
2
O
20.7.4Metazeunerite
Cu(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.7.5Zeunerite
Cu(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 12H
 
2
O
20.7.6Metanováčekite
Mg(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 4-8H
 
2
O
20.7.7Nováčekite-I
Mg(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 12H
 
2
O
20.7.8Arsenuranylite
Ca(UO
 
2
)
 
4
(AsO
 
4
)
 
2
(OH)
 
4
 · 6H
 
2
O
20.7.9Metauranospinite
Ca(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.7.10Uranospinite
Ca(UO
 
2
)(AsO
 
4
)
 
2
 · 10H
 
2
O
20.7.11Metaheinrichite
Ba(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.7.12Heinrichite
Ba(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 10H
 
2
O
20.7.13Metalodèvite
Zn(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 10H
 
2
O
20.7.14Arsenuranospathite
HAl(UO
 
2
)
 
4
(AsO
 
4
)
 
4
 · 40H
 
2
O
20.7.15Hallimondite
Pb
 
2
(UO
 
2
)(AsO
 
4
)
 
2
 · nH
 
2
O, 0 ≤ n ≤ 0.5
20.7.16Hügelite
Pb
 
2
(UO
 
2
)
 
3
(AsO
 
4
)
 
2
O
 
2
 · 5H
 
2
O
20.7.17Asselbornite
Pb(BiO)
 
3
(UO
 
2
)
 
4
(AsO
 
4
)
 
2
(OH)
 
7
·4H
 
2
O
20.7.19Kahlerite
Fe(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 12H
 
2
O
20.7.20Metakirchheimerite
Co(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 8H
 
2
O

Other Names for Metakahlerite

Other Languages:
German:Metakahlerit
Spanish:Metakahlerita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Metakahlerite

Reference List:

- +
American Mineralogist (1960): 45: 254.
Walenta, K. (1964): Rare arsenate minerals with special consideration of occurrences in the Black Forest. Mineral. Petrog. Mitt. 9, 111-174. (in German)
American Mineralogist (1986): 71: 1037-1044.
Locock, Andrew J.; Burns, Peter C.; Flynn, Theodore M. (2004): Divalent transition metals and magnesium in structures that contain the autunite-type sheet. Canadian Mineralogist 42, 1699-1718.

Internet Links for Metakahlerite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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    • Localities for Metakahlerite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Austria
     
    • Carinthia
      • Friesach - Hüttenberg area
        • Hüttenberg
          • Hüttenberger Erzberg
            • Lölling District
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Menzenschwand
    		Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
        • Schenkenzell
          • Wittichen
    		Markl, G. & Slotta, C. (2011): Die Uranmineralien des Lagerstättenreviers Wittichen im mittleren Schwarzwald. Lapis 36 (3), 25-37; 54 (in German).
            • Böckelsbach valley
    		Am Min, 45 (1960) 254; Am Min 71 (1986), 1037; Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992; American Mineralogist, Volume 84, pages 1195–1198, 1999
            • Burgfelsen
    		No reference listed
            • Wüstenbächle
    		K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
        • Sulzburg
    		K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
        • Titisee-Neustadt
          • Hammereisenbach
    		K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
    • Rhineland-Palatinate
      • Hunsrück Mts
        • Birkenfeld
          • Ellweiler
    		Aufschluss 69/(7+8), Lapis 79/(7+8)
    Namibia
     
    • Kunene Region
      • Damaraland District
        • Omaruru
    		Jahn, S. & Bast, R. (2006): Der Krantzberg bei Omaruru, Namibia, und die Mineralvorkommen in seiner Umgebung. Mineralien-Welt 17 (3), 32-48.
    South Africa
     
    • Western Cape Province
      • Beaufort West District
    		Minerals of South Africa
    Switzerland
     
    • Wallis (Valais)
      • Binn Valley
    		Krzemnicki, M. (1992): As-Bi-Mineralisationen in der Monte-Leone-Decke im Mättital (Binntal-Region). Diplomarbeit, Universität Basel, Switzerland, 122 S.
      • Le Trient Valley
        • Les Marécottes
    		Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 272.
    UK
     
    • Scotland
      • Dumfries & Galloway (Kirkcudbrightshire)
        • Dalbeattie
    		BMS Database
        • Needle's Eye
    		BMS Database
    Mineral and/or Locality
    Search Google
     
    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 21st Jun 2011 10:36:01
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