Pargasite Oberti R, Ungaretti L, Cannillo E, Hawthorne F C, Memmi I European Journal of Mineralogy 7 (1995) 1049-1063 Temperature-dependent Al order-disorder in the tetrahedral double chain of C2/m amphiboles Sample: S(6) Note: O(5) y-coordinate changed to reproduce reported bond lengths _database_code_amcsd 0006604 9.867 18.044 5.318 90 105.06 90 C2/m atom x y z occ Biso NaA 0 1/2 0 .09 5.76 KA 0 1/2 0 .02 5.76 NaAm .0341 1/2 .0664 .09 3.97 KAm .0341 1/2 .0664 .02 3.97 NaA2 0 .4664 0 .09 5.09 KA2 0 .4664 0 .02 5.09 MgM1 0 .0889 1/2 .69 .63 FeM1 0 .0889 1/2 .31 .63 MgM2 0 .1779 0 .49 .58 AlM2 0 .1779 0 .16 .58 TiM2 0 .1779 0 .105 .58 FeM2 0 .1779 0 .235 .58 NiM2 0 .1779 0 .005 .58 ZnM2 0 .1779 0 .005 .58 MgM3 0 0 0 .61 .55 AlM3 0 0 0 .05 .55 FeM3 0 0 0 .34 .55 CaM4 0 .2799 1/2 .46 .90 MnM4 0 .2799 1/2 .005 .90 FeM4 0 .2799 1/2 .035 .90 CaM4' 0 .2526 1/2 .46 .76 MnM4' 0 .2526 1/2 .005 .76 FeM4' 0 .2526 1/2 .035 .76 AlT1 .2806 .0853 .3011 .05 .48 SiT1 .2806 .0853 .3011 .95 .48 AlT2 .2907 .1721 .8116 .10 .52 SiT2 .2907 .1721 .8116 .90 .52 H .1897 0 .7511 .986 2.51 O1 .1079 .0889 .2147 .77 O2 .1186 .1740 .7330 .73 O3 .1093 0 .7143 .986 .81 F3 .1093 0 .7143 .014 .81 O4 .3687 .2497 .7905 .97 O5 .3492 .1386 .1104 1.00 O6 .3428 .1176 .6017 1.03 O7 .3358 0 .2819 1.20