Preiswerkite Oberti R, Ungaretti L, Tlili A, Smith D C, Robert J-L American Mineralogist 78 (1993) 1290-1298 The crystal structure of preiswerkite Sample: KP9 _database_code_amcsd 0001620 5.225 9.050 9.791 90 100.27 90 C2/m atom x y z occ Biso B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) SiT .5709 .1666 .2126 .5 .0034 .0016 .0014 .0000 .0004 .0000 AlT .5709 .1666 .2126 .5 .0034 .0016 .0014 .0000 .0004 .0000 Mg1 0 .5 .5 .85 .0032 .0022 .0025 0 .0006 0 Al1 0 .5 .5 .15 .0032 .0022 .0025 0 .0006 0 Mg2 0 .8291 .5 .5 .0061 .0016 .0017 0 .0002 0 Al2 0 .8291 .5 .5 .0061 .0016 .0017 0 .0002 0 Na 0 0 0 .85 .0107 .0042 .0032 0 .0014 0 O1 .8546 .1971 .1593 .0068 .0009 .0026 .0012 .0013 -.0003 O2 .4487 0 .1598 .0029 .0010 .0032 0 .0021 0 O3 .6285 .1685 .3918 .0111 .0024 .0017 .0003 -.0005 .0008 Oh4 .1335 0 .3970 .0122 .0070 .0023 0 .0012 0 H .0749 0 .3042 1.00