Dmisteinbergite
Takeuchi Y, Donnay G
Acta Crystallographica 12 (1959) 465-470
The crystal structure of hexagonal CaAl2Si2O8
_database_code_amcsd 0009229
5.10 5.10 14.72 90 90 120 P6_3/mcm
atom   x   y     z occ
Ca     0   0     0
Al   1/3 2/3 .1375  .5
Si   1/3 2/3 .1375  .5
O1   1/3 2/3   .25
O2   .37   0    .1