Akermanite
Warren B
Zeitschrift fur Kristallographie 74 (1930) 131-138
The structure of melitite (Ca,Na)2(Mg,Al)(Si,Al)2O7
_cod_database_code 1010215
_database_code_amcsd 0017151
7.73 7.73 5.01 90 90 90 P-42_1m
atom   x   y    z
Ca   .33 .17 -.49
Si   .14 .36 -.05
Mg     0   0    0
O1    .5   0  .19
O2   .14 .36  .26
O3   .08 .18 -.19