AM_Hennomartinite_1
Formula: Sr Mn2 Si2 O10 H4
Name: Hennomartinite
Unit cell: 6.255 9.067 13.431 90.0 90.0 90.0 , V=761.73
Space group: CMCM (63)

Libowitzky E , Armbruster T , American Mineralogist , 81 (1996) p.9-18, Lawsonite-type phase transitions in hennomartinite, SrMn2[Si2O7](OH)2.H2O, T = 245 C