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.
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 Encoding
ASCII-7:
Jorgkellerite
Unique Identifiers
Mindat ID:
46679
Long-form identifier:
mindat:1:1:46679:8
IMA Classification of Jörgkellerite
Approved
IMA Formula:
(Na,◻)3Mn3+3(PO4)2(CO3)(O,OH)2·5H2O
Approval year:
2015
First published:
2017
Type description reference:
Zaitsev, Anatoly N., Britvin, Sergey N., Kearsley, Anton, Wenzel, Thomas, Kirk, Caroline (2017) Jörgkellerite, Na3Mn3+3(PO4)2(CO3)O2·5H2O, a new layered phosphate-carbonate mineral from the Oldoinyo Lengai volcano, Gregory rift, northern Tanzania. Mineralogy and Petrology, 111 (3) 373-381 doi:10.1007/s00710-016-0487-6
Classification of Jörgkellerite
8.DO.50
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
O : With CO3, SO4, SiO4
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
O : With CO3, SO4, SiO4
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 for Standard |
|---|---|---|
| Jgk | 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 Jörgkellerite
Vitreous
Colour:
Brown
Hardness:
3 on Mohs scale
Cleavage:
Perfect
Micaceous, on {001}
Micaceous, on {001}
Density:
2.56 g/cm3 (Calculated)
Optical Data of Jörgkellerite
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.
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Pleochroism:
Visible
Comments:
Dark brown (O), light brown (E)
Chemistry of Jörgkellerite
Mindat Formula:
(Na,◻)3Mn3+3(PO4)2(CO3)(O,OH)2 · 5H2O
Element Weights:
Crystallography of Jörgkellerite
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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) |
Reference:
Zaitsev, Anatoly N., Britvin, Sergey N., Kearsley, Anton, Wenzel, Thomas, Kirk, Caroline (2017) Jörgkellerite, Na3Mn3+3(PO4)2(CO3)O2·5H2O, a new layered phosphate-carbonate mineral from the Oldoinyo Lengai volcano, Gregory rift, northern Tanzania. Mineralogy and Petrology, 111 (3) 373-381 doi:10.1007/s00710-016-0487-6
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Jörgkellerite
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:
Reference:
Zaitsev, Anatoly N., Britvin, Sergey N., Kearsley, Anton, Wenzel, Thomas, Kirk, Caroline (2017) Jörgkellerite, Na3Mn3+3(PO4)2(CO3)O2·5H2O, a new layered phosphate-carbonate mineral from the Oldoinyo Lengai volcano, Gregory rift, northern Tanzania. Mineralogy and Petrology, 111 (3) 373-381 doi:10.1007/s00710-016-0487-6
Synonyms of Jörgkellerite
Other Language Names for Jörgkellerite
Dutch:Jörgkelleriet
German:Jörgkellerit
Related Minerals - Strunz-mindat Grouping
| 8.DO. | Whiterockite | CaMgMn3+3O2(PO4)2(CO3)F · 5H2O |
| 8.DO.05 | Girvasite | NaCa2Mg3(PO4)3(CO3)(H2O)6 |
| 8.DO.10 | Voggite | Na2Zr(PO4)(CO3)(OH) · 2H2O |
| 8.DO.15 | Peisleyite | Na2Al9[(P,S)O4]8(OH)6 · 28H2O |
| 8.DO.20 | Perhamite | Ca3Al7.7Si3P4O23.5(OH)14.1 · 8H2O |
| 8.DO.20 | Krásnoite | Ca3Al7.7Si3P4O23.5(OH)12.1F2 · 8H2O |
| 8.DO.25 | Saryarkite-(Y) | Ca(Y,Th)Al5(SiO4)2(PO4,SO4)2(OH)7 · 6H2O |
| 8.DO.30 | Micheelsenite | (Ca2Y)Al(PO3OH)(CO3)(OH)6 · 12H2O |
| 8.DO.40 | Parwanite | (Na,K)(Mg,Ca)4Al8(PO4)8(CO3)(OH)7 · 30H2O |
| 8.DO.45 | Skorpionite | Ca3Zn2(PO4)2(CO3)(OH)2 · H2O |
| 8.DO.55 | Juansilvaite | Na5Al3[AsO3(OH)]4[AsO2(OH)2]2(SO4)2 · 4H2O |
| 8.DO.60 | Vanderheydenite | Zn6(PO4)2(SO4)(OH)4 · 7H2O |
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 Jörgkellerite
mindat.org URL:
https://www.mindat.org/min-46679.html
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Please feel free to link to this page.
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References for Jörgkellerite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter 26. Mineralogical Magazine, 79 (4) 941-947 doi:10.1180/minmag.2015.079.4.05
Zaitsev, Anatoly N., Britvin, Sergey N., Kearsley, Anton, Wenzel, Thomas, Kirk, Caroline (2017) Jörgkellerite, Na3Mn3+3(PO4)2(CO3)O2·5H2O, a new layered phosphate-carbonate mineral from the Oldoinyo Lengai volcano, Gregory rift, northern Tanzania. Mineralogy and Petrology, 111 (3) 373-381 doi:10.1007/s00710-016-0487-6
Localities for Jörgkellerite
Showing 1 localities.
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.
Tanzania (TL) | |
| Hålenius et al. (2015) +1 other reference |
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