Where it forms, where it's found
- Type locality
- Sophia Mine
- Böckelsbach valley
- Wittichen
- Schenkenzell
- Rottweil
- Freiburg Region
- Baden-Württemberg
- Germany
48.3333°, 8.3333°
18recorded occurrences
Radioactivity
Physical
Optical
- Optical type
- Uniaxial (-)
- Refractive index
- 1.608 – 1.642
- Surface relief
- Moderate
- Principal indices
- nω 1.642 · nε 1.608
Δ = 0Δmax
PPLpleochroism per grain
XPLindependent extinctions · rotate the stage
PPLpleochroism only · colour blends on rotation
XPLinterference colour · extinct every 90°
Retardation340 nm
Order1st order
XPL colour
Crystallography
- Cell parameters
- a = 7.2072 Å · b = 9.8242 Å · c = 13.2708 Å
- Cell angles
- α = 75.37 ° · β = 84.024 ° · γ = 81.839 °
- Ratio a:b:c
- 1 : 1.363 : 1.841
Crystal structure
Chemical composition
Synonyms
- Metakahleriet
In other languages
- German
- Metakahlerit
- Italian
- Metakahlerite
Classification
Strunz
10th ed.8.EB.10
- 8Phosphates, Arsenates, VanadatesClass
- 8.EUranyl phosphates and arsenatesDivision
- 8.EBUO2:RO4 = 1:1Group
- 8.EB.10MetakahleriteSpecies
Dana
8th ed.40.2a.15.02
- 40Hydrated Normal Phosphates, Arsenates and VanadatesClass
- 40.2aAB2(XO4)2·xH2O, containing (UO2)2+Type
- 40.2a.15— unnamed intermediate level —Group
- 40.2a.15.02MetakahleriteSpecies
CIM
—20.7.18
- 20Arsenates (also arsenates with phosphate, but without other anions)Class
- 20.7Arsenates of UGroup
- 20.7.18MetakahleriteSpecies
Group, growth & confusion
AbernathyiteK(UO2)(AsO4) · 3H2OMineral—- ArsenosabugaliteH0.5Al0.5(UO2)2(AsO4)2·8H2OMineral—
Chernikovite(H3O)(UO2)(PO4) · 3H2OMineral—
LehneriteMn2+(UO2)2(PO4)2 · 8H2OMineral—
Meta-ankoleiteK(UO2)(PO4) · 3H2OMineral—
Meta-autuniteCa(UO2)2(PO4)2 · 6H2OMineral—
MetaheinrichiteBa(UO2)2(AsO4)2 · 8H2OMineral—- MetakirchheimeriteCo(UO2)2(AsO4)2 · 8H2OMineral—
- MetalodèviteZn(UO2)2(AsO4)2 · 10H2OMineral—
- MetanatroautuniteNa(UO2)(PO4) · 3H2OMineral—
Literature, links & citation
Citations
- 1958Walenta, Kurt (1958) Die sekundären Uranmineralien des Schwarzwaldes. Jahreshefte des geologischen Landesamtes in Baden-Württemberg: 3: 17-51.
- 1960Fleischer, M. F. (1960) New Mineral Names; New data; Redefinition of mineral. American Mineralogist, 45 (1-2). 252-258
- 1964Walenta, Kurt, Walenta, Kurt (1964) Beiträge zur Kenntnis seltener Arsenatmineralien unter besonderer Berücksichtigung von Vorkommen des Schwarzwaldes. 1. Folge. [Rare arsenate minerals with special consideration of occurrences in the Black Forest. Part I]. Tschermaks Mineralogische und Petrographische Mitteilungen, 9 (1). 111-174 doi:10.1007/bf01127780DOI: 10.1007/bf01127780
- 1986Vochten, 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
- 2004Locock, A. J., Burns, P. C., Flynn, T. M. (2004) Divalent transition metals and magnesium in structures that contain the autunite-type sheet. The Canadian Mineralogist, 42 (6) 1699-1718 doi:10.2113/gscanmin.42.6.1699 DOI: 10.2113/gscanmin.42.6.1699
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Metakahlerite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/metakahlerite-2676},
note = {Accessed 2026-05-11}
}