AM_Armbrusterite
Formula: K5 Na6 Mn15 Si36 O104.02 H46
Name: Armbrusterite
Unit cell: 17.333 23.539 13.4895 90.0 115.069 90.0 , V=4985.27
Space group: C12/M1 (12)

Yakovenchuk V N , Krivovichev S K , Pakhomovsky Y A , Ivanyuk G Y , Selivanova E A , Men’shikov Y P , Britvin S N , American Mineralogist , 92 (2007) p.416-423, Armbrusterite, K5Na6Mn3+Mn2+14[Si9O22]4(OH)10*4H2O, a new Mn hydrous, heterophyllosilicate from the Khibiny alkaline massif, Kola Peninsula, Russia, Locality: Khibiny alkaline massif, Kola Peninsula, Russia