Pargasite Hawthorne F C, Oberti R, Sardone N The Canadian Mineralogist 34 (1996) 577-593 Sodium at the A site in clinoamphiboles: the effects of composition on patterns of order Sample: A9 - BM47 N.1 _database_code_amcsd 0005494 9.870 17.991 5.291 90 105.08 90 C2/m atom x y z occ Biso SiT1 .2808 .0854 .3017 .81 .46 AlT1 .2808 .0854 .3017 .19 .46 SiT2 .2902 .1725 .8096 .52 MgM1 0 .0876 .5 .82 .68 FeM1 0 .0876 .5 .13 .68 TiM1 0 .0876 .5 .05 .68 AlM2 0 .1773 0 .12 .57 CrM2 0 .1773 0 .14 .57 FeM2 0 .1773 0 .07 .57 MgM2 0 .1773 0 .67 .57 MgM3 0 0 0 .71 .56 FeM3 0 0 0 .17 .56 AlM3 0 0 0 .12 .56 FeM4 0 .2784 .5 .04 .83 CaM4 0 .2784 .5 .37 .83 NaM4 0 .2784 .5 .09 .83 FeM4' 0 .2532 .5 .04 1.08 CaM4' 0 .2532 .5 .37 1.08 NaM4' 0 .2532 .5 .09 1.08 NaAm .0326 .5 .0697 .160 3.45 KAm .0326 .5 .0697 .038 3.45 NaA2 0 .4758 0 .220 3.40 KA2 0 .4758 0 .050 3.40 H .1860 0 .7687 .97 .79 O1 .1076 .0869 .2183 .74 O2 .1193 .1719 .7297 .73 Oh3 .1074 0 .7151 .97 .84 F3 .1074 0 .7151 .03 .84 O4 .3660 .2497 .7871 1.05 O5 .3493 .1387 .1078 1.04 O6 .3442 .1155 .6080 1.08 O7 .3403 0 .2769 1.21