Metakirchheimerite (original) (raw)

A valid IMA mineral species - grandfathered

About MetakirchheimeriteHide

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Formula:

Co(UO2)2(AsO4)2 · 8H2O

Colour:

pale pink, greenish yellow to colorless

Name:

For Professor Franz Waldemar Kirchheimer (1 July 1911, Müllheim, Germany – 17 June 1984, Freiburg im Breisgau, Germany), former Director of the Geological Survey of Baden-Württemberg, Germany, geologist, palaeontologist and mining historian, for his contribution on uranium deposits in Baden-Württemberg.

Meta-autunite Group.

The lower hydrate of "kirchheimerite", a non-approved species which contains 12 water molecules per formula unit (Walenta, 1964; Locock et al., 2004).

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2677:8

d9bdd33d-74a3-4076-bd94-2b3092890041

IMA Classification of MetakirchheimeriteHide

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Approved, 'Grandfathered' (first described prior to 1959)

Type description reference:

Classification of MetakirchheimeriteHide

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8.EB.10

8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
B : UO2:RO4 = 1:1

40.2a.17.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2a : AB2(XO4)2·xH2O, containing (UO2)2+

20.7.20

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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of MetakirchheimeriteHide

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Colour:

Pale pink, greenish yellow to colorless

Optical Data of MetakirchheimeriteHide

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RI values:

_n_ω = 1.644 _n_ε = 1.617

δ = 0.027

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Pleochroism:

Non-pleochroic

Chemistry of MetakirchheimeriteHide

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Mindat Formula:

Co(UO2)2(AsO4)2 · 8H2O

Crystallography of MetakirchheimeriteHide

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Class (H-M):

1 - Pinacoidal

Cell Parameters:

a = 7.1955 Å, b = 9.7715 Å, c = 13.2319 Å
α = 75.525°, β = 84.052°, γ = 81.661°

Ratio:

a:b:c = 0.736 : 1 : 1.354

Unit Cell V:

889.08 ų (Calculated from Unit Cell)

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0005993	Metakirchheimerite	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

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of MetakirchheimeriteHide

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Reference:

Walenta, K. (1958) Die sekundaren Uranmineralien des Schwarzwaldes. Jahresheft des Geologischen Landesant Baden-Wurttemberg: 3: 17-51.

Other Language Names for MetakirchheimeriteHide

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Relationship of Metakirchheimerite to other SpeciesHide

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Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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 MetakirchheimeriteHide

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References for MetakirchheimeriteHide

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Reference List:

Plášil, J., Čejka, J., Sejkora, J., Hloušek, J., Goliáš, V. (2009) New data for metakirchheimerite from Jáchymov (St. Joachimsthal), Czech Republic. Journal of GEOsciences, 54 (4) 373-384

Hazen, Robert M., Hystad, Grethe, Golden, Joshua J., Hummer, Daniel R., Liu, Chao, Downs, Robert T., Morrison, Shaunna M., Ralph, Jolyon, Grew, Edward S. (2017) Cobalt mineral ecology. American Mineralogist, 102 (1) 108-116 doi:10.2138/am-2017-5798

Localities for MetakirchheimeriteHide

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This 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.

Locality ListHide

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- 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.