Danalite Hassan I, Grundy H D American Mineralogist 70 (1985) 186-192 The crystal structures of helvite group minerals, (MnFeZn)8(Be6Si6O24)S2 _database_code_amcsd 0000971 8.218 8.218 8.218 90 90 90 P-43n atom x y z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Fe .1687 .1687 .1687 .0068 .0068 .0068 .0004 .0004 .0004 O .1394 .14 .4114 .0071 .0070 .0047 .0026 .0008 .0009 Be .25 0 .5 .0097 .0055 .0055 0 0 0 Si .25 .5 0 .0034 .0030 .0030 0 0 0 S 0 0 0 .0096 .0096 .0096 0 0 0