AM_Margarite-2M1 Formula: Ca Si2 Al4 H2 O12 Name: Margarite-2M1 Unit cell: 5.1038 8.8287 19.148 90.0 95.46 90.0 , V=858.89 Space group: C1C1 (9)

Guggenheim S , Bailey S W , American Mineralogist , 60 (1975) p.1023-1029, Refinement of the margarite structure in subgroup symmetry