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The root name is in honor of Richard Henry Jahns (March 10, 1915 Los Angeles, California, USA - December 31, 1983 Palo Alto, California, USA), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA. The suffix indicates metal site occupancies.

Type Locality
Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
Mineral Data
Mn2+Mn2+Mg2Fe3+2(PO4)4(OH)2 · 8H2O
Physical Properties
Crystal System: