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Jörgkellerite

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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
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.

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


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Classification of JörgkelleriteHide

Approved
Approval Year:
2015
First Published:
2017

Physical Properties of JörgkelleriteHide

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

Optical Data of JörgkelleriteHide

Type:
Uniaxial (-)
RI values:
nω = 1.700() nε = 1.625(2)
Max Birefringence:
δ = 0.075
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Visible
Comments:
Dark brown (O), light brown (E)

Chemical Properties of JörgkelleriteHide

Formula:
(Na,☐)3Mn3+3(PO4)2(CO3)(O,OH)2·5H2O
IMA Formula:
Na3Mn3+3(PO4)2(CO3)O2 · 5H2O

Crystallography of JörgkelleriteHide

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

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

Type Occurrence of JörgkelleriteHide

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

Other InformationHide

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

References for JörgkelleriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Zaitsev, A.N., Britvin, S.N., Kearsley, A., Wenzel, T. and Kirk, C. (2015) Jörgkellerite, IMA 2015-020. CNMNC Newsletter No. 26, August 2015, page 942; Mineralogical Magazine: 79: 941-947.
Zaitsev, A.N., Britvin, S.N., Kearsley, A., Wenzel, T., Kirk, C. (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: 373–381.

Internet Links for JörgkelleriteHide

Localities for JörgkelleriteHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Tanzania (TL)
 
  • Arusha Region
Zaitsev, A.N., Britvin, S.N., Kearsley, A., Wenzel, T. and Kirk, C. (2015) Jörgkellerite, IMA 2015-020. CNMNC Newsletter No. 26, August 2015, page 942; Mineralogical Magazine, 79, 941-947; Zaitsev, A.N., Britvin, S.N., Kearsley, A., Wenzel, T., Kirk, C. (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, 373–381.
Mineral and/or Locality  
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