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⇱ Jörgkellerite: Mineral information, data and localities.

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Jörgkellerite

A valid IMA mineral species
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Formula:
(Na,◻)3Mn3+3(PO4)2(CO3)(O,OH)2 · 5H2O
Colour:
Brown
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
2.56 (Calculated)
Crystal System:
Trigonal
Name:
Named in honor of Jörg Keller (b. 29 October 1938, Freiburg, Germany), volcanologist and professor at the University of Freiburg, Germany, for his valuable contributions to the study of the origin and evolution of alkaline rocks and carbonatites, and particularly the Oldoinyo Lengai volcano.
New structure type. Layered phosphate-carbonate mineral.

The layers are built of disordered edge-sharing MnO6 octahedra. Each fourth Mn site in octahedral layer is vacant leading to an ordered system of hexagonal "holes" that contain the carbonate groups, thus leading to the following layer composition: [Mn3O8(CO3)]. The Mn-CO3 layers are joined by the phosphate tetrahedra and Na-bearing polyhedra.

Structurally related to whiterockite.

The mineral results from low-temperature oxidation of gregoryite-nyerereite carbonatites.


Name EncodingHide

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ASCII-7:
Jorgkellerite

Unique IdentifiersHide

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Mindat ID:
46679
Long-form identifier:
mindat:1:1:46679:8

IMA Classification of JörgkelleriteHide

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Approved
IMA Formula:
Na3Mn3+3(PO4)2(CO3)O2 · 5H2O
Approval year:
2015
First published:
2017

Classification of JörgkelleriteHide

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8.DO.50

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
O : With CO3, SO4, SiO4

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.

SymbolSourceReference for Standard
JgkIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of JörgkelleriteHide

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Vitreous
Colour:
Brown
Hardness:
Cleavage:
Perfect
Micaceous, on {001}
Density:
2.56 g/cm3 (Calculated)

Optical Data of JörgkelleriteHide

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Type:
Uniaxial (-)
RI values:
nω = 1.700(2) nε = 1.625(2)
Max. Birefringence:
δ = 0.075
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.

Surface Relief:
Moderate
Pleochroism:
Visible
Comments:
Dark brown (O), light brown (E)

Chemistry of JörgkelleriteHide

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Mindat Formula:
(Na,◻)3Mn3+3(PO4)2(CO3)(O,OH)2 · 5H2O
Element Weights:
Element% weight
O47.538 %
Mn27.206 %
Na11.385 %
P10.226 %
C1.983 %
H1.664 %

Calculated from ideal end-member formula.

Crystallography of JörgkelleriteHide

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Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
P3
Cell Parameters:
a = 11.201(2) Å, c = 10.969(2) Å
Ratio:
a:c = 1 : 0.979
Unit Cell V:
1191.9 ų
Z:
3

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
10.970 Å(100)
5.597 Å(15)
4.993 Å(8)
3.659 Å(4)
3.234 Å(6)
2.796 Å(14)
2.724 Å(20)
2.189 Å(5)
Comments:
From Type Description.

Geological EnvironmentHide

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Paragenetic Mode(s):

Type Occurrence of JörgkelleriteHide

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General Appearance of Type Material:
Spherulites (up to 200 μm in size), built of plates (up to 10 μm thick)
Place of Conservation of Type Material:
Type material is deposited in the collections of the Mineralogy Department, St. Petersburg State University, St. Petersburg, Russia 199034, catalogue number 19640/1
Geological Setting of Type Material:
Shortite-calcite and calcite carbonatites
Associated Minerals at Type Locality:

Synonyms of JörgkelleriteHide

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Other Language Names for JörgkelleriteHide

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Related Minerals - Strunz-mindat GroupingHide

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8.DO.WhiterockiteCaMgMn3+3O2(PO4)2(CO3)F · 5H2OMon. 2/m : B2/m
8.DO.05GirvasiteNaCa2Mg3(PO4)3(CO3)(H2O)6Mon. 2/m : P21/b
8.DO.10VoggiteNa2Zr(PO4)(CO3)(OH) · 2H2OMon. 2/m
8.DO.15PeisleyiteNa2Al9[(P,S)O4]8(OH)6 · 28H2OTric. 1 : P1
8.DO.20PerhamiteCa3Al7.7Si3P4O23.5(OH)14.1 · 8H2OTrig. 3m(32/m) : P3m1
8.DO.20KrásnoiteCa3Al7.7Si3P4O23.5(OH)12.1F2 · 8H2OTrig. 3m(32/m) : P3m1
8.DO.25Saryarkite-(Y)Ca(Y,Th)Al5(SiO4)2(PO4,SO4)2(OH)7 · 6H2OTet. 422
8.DO.30Micheelsenite(Ca2Y)Al(PO3OH)(CO3)(OH)6 · 12H2OHex. 6 : P63
8.DO.40Parwanite(Na,K)(Mg,Ca)4Al8(PO4)8(CO3)(OH)7 · 30H2OMon. 2 : P2
8.DO.45SkorpioniteCa3Zn2(PO4)2(CO3)(OH)2 · H2OMon. 2/m : B2/b
8.DO.55JuansilvaiteNa5Al3[AsO3(OH)]4[AsO2(OH)2]2(SO4)2 · 4H2OMon. 2/m : B2/b
8.DO.60VanderheydeniteZn6(PO4)2(SO4)(OH)4 · 7H2OMon. 2/m

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 JörgkelleriteHide

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mindat.org URL:
https://www.mindat.org/min-46679.html
Please feel free to link to this page.

References for JörgkelleriteHide

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Localities for JörgkelleriteHide

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Showing 1 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 👁 Image
symbol to view information about a locality. The 👁 Image
symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- 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.
Tanzania (TL)
  • Arusha region
    • Ngorongoro District
Hålenius et al. (2015) +1 other reference
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