Chkalovite Pyatenko Y A, Bokii G B, Belov N V Doklady Akademii Nauk SSSR 108 (1956) 1077-1080 The X-ray analysis of the crystal structure of chkalovite _database_code_amcsd 0012436 21.1 21.1 6.87 90 90 90 Fddd atom x y z Be1 0 0 0 Be2 0 .33 0 Si1 .346 0 0 Si2 .071 .093 .25 Na1 .154 0 0 Na2 .071 .093 .75 O1 .125 .125 .125 O2 .04 .03 .16 O3 .03 .13 .37 O4 .13 .06 .37 O5 .2 .04 .66