AM_Margarite Formula: Ca Al4 Si2 O12 H2 Name: Margarite Unit cell: 5.104 8.829 19.148 90.0 95.5 90.0 , V=858.90 Space group: C1C1 (9)

Guggenheim S , Bailey S W , American Mineralogist , 63 (1978) p.186-187, Refinement of the margarite structure in subgroup symmetry: correction,, further refinement, and comments