Pargasite Makino K, Tomita K American Mineralogist 74 (1989) 1097-1105 Cation distribution in the octahedral sites of hornblendes sample E-P from Einstodingen, Antarctica _database_code_amcsd 0001268 9.900 17.95 5.311 90 105.42 90 C2/m atom x y z occ Biso Si1 .2776 .0863 .3049 .50 0.44 Al1 .2776 .0863 .3049 .50 0.44 Si2 .2961 .1741 .8162 .99 0.47 Al2 .2961 .1741 .8162 .01 0.47 Mg1 0 .0903 .5 .822 0.92 Fe1 0 .0903 .5 .178 0.92 Mg2 0 .1768 0 .838 0.63 Fe2 0 .1768 0 .162 0.63 Mg3 0 0 0 .780 0.87 Fe3 0 0 0 .220 0.87 Ca4 0 .2809 .5 .995 0.67 Na4 0 .2809 .5 .005 0.67 NaAm .0203 .5 .0426 .94 1.73 O1 .1045 .0902 .2148 0.83 O2 .1204 .1750 .7375 0.82 OH3 .1123 0 .7151 0.76 O4 .3687 .2506 .7934 0.87 O5 .3491 .1398 .1129 0.86 O6 .3418 .1186 .6108 0.92 O7 .3344 0 .2880 1.20