Akermanite
Kusaka K, Hagiya K, Ohmasa M, Okano Y, Mukai M, Iishi K, Haga N
Physics and Chemistry of Minerals 28 (2001) 150-166
Determination of structures of Ca2CoSi2O7, Ca2MgSi2O7, and Ca2(Mg.55Fe.45)Si2O7
in incommensurate and normal phases and observation of diffuse streaks at high temperature
Sample: T = 348 K
Melilite group
_database_code_amcsd 0008518
7.8387 7.8387 5.0079 90 90 90 P-42_1m
atom      x      y     z Biso
Mg        0      0     0  .67
Ca   .33195 .16805 .5063 1.28
Si    .1398  .3602 .9345  .56
O1        0     .5  .820  1.8
O2    .1402  .3598 .2548 1.50
O3    .0825  .1866 .7876 1.63