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Jörgkellerite

About

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.

Type Locality
Mount Oldoinyo Lengai (Ol Doinyo Lengai), Arusha Region, Tanzania
Mineral Data
(Na,☐)3Mn3+3(PO4)2(CO3)(O,OH)2·5H2O
Physical Properties
Colour: 
Brown
Crystal System: 
Trigonal
Hardness: 
3
Synonyms
Synonyms: 
IMA2015-020